Exploration Implications of Total Petroleum System in Fengcheng Formation, Mahu Sag, Junggar Basin

doi:10.7657/XJPG20210601

Abstract

Abstract:

As a globally typical total petroleum system, the Fengcheng formation in the Mahu Sag of the Junggar basin has representative significance in terms of exploration. Taking the discovery of oil and gas reserves and key wells as the main line, and considering the improvement on exploration idea and theory, the oil and gas exploration history of the Fengcheng formation is reviewed and then divided into 3 major stages: conventional oil and gas exploration in the fault zone outside the source, multi-type risky exploration and inner-source total petroleum system exploration. Consequently, many implications have been obtained: the high-quality alkaline-lacustrine source rock in the Fengcheng formation can be considered as the key target for exploration; under the joint actions of terrigenous clast sedimentation, inner-source chemical sedimentation and volcanic activity, the all-type reservoirs with a stratigraphic sequence of orderly distributed glutenite-dolomitic sandstone-dolomitic mudstone and argillaceous dolomite are developed in the Fengcheng formation, and the stratigraphic sequence coexists with conventional volcanic rocks and fractured reservoirs; within the Fengcheng formation, controlled by facies sequence, all types of reservoirs including conventional oil reservoir, tight oil reservoir and shale oil reservoir coexist orderly. The total petroleum system in the Fengcheng formation is a typical example in the world. It reflects the concept of a total petroleum system, realizes the transformation from theory to practice, enriches and develops the theories of oil and gas systems in continental petroliferous basins, and guides the “inside sag” exploration of the hydrocarbon-rich sags in the Junggar basin. The review may be an important reference to oil and gas exploration in other major petroliferous basins in China.

Key words: Junggar basin, Mahu sag, Fengcheng formation, conventional reservoir, unconventional reservoir, total petroleum system, alka-line-lacustrine source rock

CLC Number:

TE122

HE Wenjun, QIAN Yongxin, ZHAO Yi, LI Na, ZHAO Xinmei, LIU Guoliang, MIAO Gang. Exploration Implications of Total Petroleum System in Fengcheng Formation, Mahu Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2021, 42(6): 641-655.

Figures/Tables 11

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