Petroleum exploration progress and new field of Sinopec in Ordos Basin during the 13th Five-Year Plan period

doi:10.3969/j.issn.1672-7703.2022.05.001

Abstract

Abstract: In the early 13^th Five-Year Plan period, petroleum exploration of Sinopec North China Oil & Gas Company in Ordos Basin was faced with challenges in producing natural gas reserves, unclear understanding of oil accumulation law, and uncertain resource replacement fields. In the past five years, by strengthening the integral structure and sedimentary evolution study in the basin, the differential configuration of hydrocarbon accumulation elements was analyzed, understanding of gas differential accumulation in the Upper Paleozoic in the transitional zone at the northern basin margin was innovatively formed, and the exploration and development technology for complex water-bearing gas reservoir in basin margin was developed, which supported to discover Dongsheng Gas Field; Based on the reprocessing and interpretation of 3D seismic data, hydrocarbon accumulation in the Mesozoic tight sandstone fault-fracture body in the transitional zone at the southern basin margin was identified, and new “sweet point” types of the Mesozoic tight oil were evaluated by using “six-determination” description method of fault-fracture body oil reservoir; The fault-fracture controlled karst reservoir in marine carbonate rocks was discovered by largearea 3D seismic data reprocessing, and the reservoir development and hydrocarbon accumulation pattern in large unconformity carbonate karst reservoirs in the Lower Paleozoic was proposed. After identifying and predicting the distribution of carbonate karst reservoirs, favorable zones were selected and evaluated, and carbonate exploration in the Paleozoic in the southern basin was strengthened, which supported to prove two gas replacement fields with reserve of hundred billion cubic meter level. Finally, petroleum exploration results were summarized and geological understanding was formed that the strike-slip fault system is widely developed in the basin and karst reservoirs are controlled by faults. The comprehensive analysis indicates that the karst zones controlled by multi-stage active strike-slip faults below the deep marine carbonate weathering crust and the complex tight clastic reservoir in the peripheral basin are major exploration prospects and fields during the 14th Five-Year Plan period.

CLC Number:

TE122.1

He Faqi, Zhang Yu, Wang Fubin, Zhang Ru, Zhang Wei, Qi Rong, An Chuan, Li Xiaowei, Deng Jie. Petroleum exploration progress and new field of Sinopec in Ordos Basin during the 13^th Five-Year Plan period[J]. China Petroleum Exploration, 2022, 27(5): 1-12.

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Petroleum exploration progress and new field of Sinopec in Ordos Basin during the 13^th Five-Year Plan period

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