SMM News: 2018, the international oil price wide shock rose, the oil and gas industry warmed up. Investment in the exploration and exploitation of oil and gas resources throughout the country has continued to pick up, and the physical workload has increased rapidly. The momentum of oil and gas exploration and discovery is good, and the proven oil and gas reserves have stopped falling and recovered, adding one billion ton oil field, three hundred billion square gas fields and one hundred billion square shale gas field. Oil and gas exploitation shows a trend of "oil and gas rising", oil production remains basically stable, and natural gas production increases rapidly. The reform of oil and gas exploration and exploitation management system has been steadily promoted, and important progress has been made in oil and gas geological survey.
I. Investment in oil and gas exploration and exploitation continues to pick up
In 2018, the investment in exploration and exploitation of oil and gas (including oil, natural gas, shale gas, coalbed methane and gas hydrate) was 63.658 billion yuan and 203.106 billion yuan respectively, an increase of 8.9 percent and 24.7 percent over the same period last year, and the acquisition of two-dimensional earthquakes was 44000 kilometers, an increase of 13.5 percent over the same period last year, and a three-dimensional earthquake of 34000 square kilometers, an increase of 3.3 percent over the same period last year. 2955 exploration wells and 21107 development wells were completed, an increase of 8.4 per cent and 2.0 per cent respectively over the same period last year.
II. The increase in proven oil and gas reserves stops the decline and recovers
In 2018, the proven geological reserves of oil increased by 959 million tons, an increase of 9.4 percent over the same period last year, and increased again after two consecutive years of decline. Among them, there are three new basins with proven reserves of more than 100 million tons, namely, Ordos (8.410,-0.13,-1.52%) basin, Bohai Bay Basin (onshore) and Junggar Basin, and one new oil field with proven reserves of more than 100 million tons, which is the Heshui oil field of Ordos Basin.
The proven geological reserves of natural gas increased by 831.157 billion cubic meters, an increase of 49.7 per cent over the same period last year. Among them, there are two new basins with proven reserves of more than 100 billion cubic meters, which are Ordos and Tarim basins. There are three new gas fields with proven reserves of more than 100 billion cubic meters, which are Sulige gas field and Mizhi gas field in Ordos basin and Klassou gas field in Tarim basin.
III. Steady increase in oil and gas production
In 2018, the national oil output was 189 million tons, down 1.2 per cent from the same period last year. The basins with an output of more than 10 million tons are Bohai Bay (including sea area), Songliao, Ordos, Junggar, Tarim and Pearl River Estuary basins, accounting for 92.8% of the total.
The country's natural gas production was 141.512 billion cubic meters, an increase of 6.4 per cent over the same period last year. Among them, the basins with an output of more than 3 billion cubic meters are Ordos, Sichuan, Tarim, Chaidamu, Songliao and Pearl River Estuary basins, totaling 126.346 billion cubic meters, accounting for 89.3 percent of the national total.
By the end of 2018, there were 1027 oil and gas fields (including 746 oil fields and 281 natural gas fields), 5 shale gas fields, 24 coal seam gas fields and 3 carbon dioxide gas fields. A total of 6.952 billion tons of oil and 2.07 trillion cubic meters of natural gas were produced.
IV. Important progress has been made in the basic geological work of oil and gas
A breakthrough has been made in the investigation of gas hydrate resources in the new area of the northern South China Sea, and the preparation for the second test production of natural gas hydrate in the Shenhu area of the northern South China Sea has been carried out smoothly. Great breakthrough has been made in the investigation of shale gas in the Yangtze River economic belt, and the 2HF well in Eyang Page has made a breakthrough in the Sinian Doushantuo formation, which has expanded the new field of shale gas exploration and development. Important progress has been made in continental shale oil in Songliao Basin. Important progress has been made in the oil and gas investigation of the new strata in the new area of the Bogda Piedmont belt in the Yiner Basin, the Chaidamu Basin and the Bogda Piedmont Belt of the Junggar Basin. The industrial gas flow of coalbed methane was obtained from well Chuangaocan 2 in Yibin area of southern Sichuan.
The national evaluation of oil and gas resources during the 13th five-year Plan period was carried out in an all-round way. The key evaluation parameters of tight oil and gas, shale gas and coalbed methane have been studied. The economic evaluation of oil and gas resources and the risk assessment of ecological environment of oil and gas resources are carried out for the first time, and the evaluation of oil and gas resources is carried out for the first time.
V. conventional oil and gas exploration has made many breakthroughs in new areas, new areas and new strata
Great breakthroughs have been made in the risk exploration of well Mid-Autumn 1 in the Qiulitag structural belt of the Tarim Basin, with the discovery of a 100 billion square gas field, which provides a resource basis for the construction of a large oil and gas field of 30 million tons in Tarim. The new Ordovician oil predicted reserves in Shunbei area are 71.76 million tons, and the exploration results of Shunbei fault zone expand from west to south to deep. The evaluation of Bozhong sag in Bohai Sea has implemented the largest 100 billion square condensate gas field in eastern China-Bozhong 19-6, which provides strong support for the stable production of 30 million tons and a new step in Bohai Oilfield. Bozhong 29-6 has been successfully discovered in the high mature area of Bozhong sag, which has injected power into the continuous development of the old oil area. The shale oil exploration in Cangdong Sag of Bohai Bay Basin has made a discovery, showing the field of 50 million tons of shale oil. Industrial oil flow has been detected in Lower Wuerhe formation in Mahu 1 well area of Junggar Basin, and the predicted oil reserves have been increased by 149 million tons. Great discoveries have been made in oil exploration of Upper Wuerhe formation in Permian in Shawan sag, which is expected to form a large oil and gas accumulation area in Mahu-Shawan sag. Yuanba 7 well in Yuanba area of Sichuan Basin has discovered high-yield gas reservoir for the first time in Permian Maokou formation, with new predicted natural gas reserves of 152.7 billion cubic meters. Permian gas flow has been discovered in Yongtian well 1 in western Sichuan, which has opened up a new field of volcanic rock exploration. Jilantai Oilfield was discovered in Linhe Depression of Hetao Basin, and the predicted oil reserves were increased by 120 million tons, which broke through the situation that the basin had been attacked for more than 40 years. The ultra-high temperature and high pressure natural gas with a scale of more than 100 meters has been discovered in Ledong District of Yinggehai Basin, with reserves of hundreds of billions of square meters, which is expected to become a new position for increasing storage and production in the field of ultra high temperature and high pressure. The whole assembly and high yield oil field has been discovered in the Lufeng sag of the Pearl River mouth Basin, which is the largest commercial oil field discovered by foreign cooperation in recent 10 years.
VI. Shale gas and coalbed methane exploration and development are progressing smoothly
In 2018, 13.53 billion yuan was invested in shale gas exploration and development, 40 exploration wells and 285 development wells were drilled. The proven geological reserves of shale gas increased by 124.678 billion cubic meters, down 66.2 percent from the previous year, and the new reserves came from Sinopec (5.250,0.01,0.19 per cent) (600028) Weirong shale gas field in Sichuan Basin. The country produced 10.881 billion cubic meters of shale gas, an increase of 21.0 per cent over the previous year. The shale gas exploration of Jinfu slope in Nanchuan area of eastern Sichuan basin has made a great breakthrough, and the amount of shale gas geological resources is 196.5 billion cubic meters, which lays the resource foundation for the third phase construction of Fuling shale gas field.
In 2018, 3.925 billion yuan was invested in coalbed methane exploration and development in China, with a total of 152 exploration wells and 779 development wells. The proven geological reserves of coalbed methane were increased by 14.708 billion cubic meters, an increase of 40.3 percent over the same period last year, and the production of coalbed methane developed on the surface was 5.15 billion cubic meters, an increase of 9.5 percent over the same period last year.
VII. Progress has been made in the theory and technology of oil and gas exploration and exploitation
The progress of exploration theory and technology is an important guarantee for new discoveries in oil and gas exploration. Important progress has been made in the study of key technologies of continental shale oil exploration, which has effectively guided and promoted the exploration breakthrough and scale production of continental shale oil, such as Jimusar in Junggar Basin and Cangdong Sag in Bohai Bay Basin. A new generation of seismic technology characterized by "single point high density" in the eastern fault basin has been implemented to effectively broaden the frequency band and improve the seismic resolution. The drilling speed-up technology has a remarkable application effect in Shunbei Oilfield, and the key technology of offshore middle and deep seismic exploration has been popularized and applied in the second three-dimensional seismic exploration in the sea area. The largest integrated Bozhong 19-6 condensate gas field in eastern China has been discovered under the guidance of exploration theory and technology of large-scale integrated condensate gas field in Bohai Sea.
The innovation of exploitation technology has promoted the efficient development of oil and gas fields. The technical support of gravity miscible flooding with natural gas leads the construction of 30 million tons of oil and gas fields in Tarim and the enhancement of oil recovery in old oilfields. The results of alkali-free binary compound flooding technology have been applied in Liaohe, Xinjiang and other oilfields, and the oil recovery has been increased by more than 18% compared with the same period last year. 3800 meters of shallow shale gas fracturing technology is becoming more and more mature, and the low-cost fracturing technology has achieved good results. A series of key technologies for the development of large offshore high temperature and high pressure natural gas reservoirs in China have been formed and successfully practiced in Dongfang Gas Field Group of Yinggehai Basin. The feasibility study of micro fracturing and pressure increasing water injection in water injection wells has made progress and has been applied in Bohai Oilfield. Multi-scale comprehensive reservoir prediction technology has improved the reservoir drilling rate of tight gas reservoirs, with vertical wells up to 90% and horizontal wells up to 82%.
VIII. Exploration and Innovation of Oil and Gas Resources Management Reform
We will strengthen the management of examination and approval and registration of oil and gas mining rights. Strictly abide by the rules and regulations, take the initiative to optimize the service, and strictly withdraw from the block. By the end of December 2018, there were 924 exploration rights for oil and gas (including coalbed methane and shale gas), covering an area of 3.0946 million square kilometers, and 774 mining rights, covering an area of 164900 square kilometers. Of these, 45 are exploration rights for foreign cooperation and 37 are mining rights.
We will implement the spirit of the CPC Central Committee and the State Council on deepening the reform of the oil and gas system, study and deepen the reform of the management of oil and gas exploration and exploitation, liberalize the oil and gas exploration and exploitation market, compete for the transfer of oil and gas exploration rights, and increase the withdrawal of oil and gas exploration blocks. We will continue to push forward the pilot reform of oil and gas exploration and exploitation in Xinjiang and entrust Xinjiang with the competitive transfer of three oil and gas exploration blocks. This paper summarizes the construction experience of Chongqing Fuling shale gas exploration and development demonstration base, and continuously promotes the construction of Guizhou northern Guizhou shale gas comprehensive exploration experimental area and Sichuan southern Sichuan shale gas exploration and development experimental area. We will carry out competitive transfer of oil and gas exploration rights in sea areas and sell coal bed methane exploration blocks in Shanxi Province.
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