Exploration Breakthrough and New Insights of Baijiantan Formation in Mahu Sag and Its Periphery

doi:10.7657/XJPG20240306

Abstract

Abstract:

In order to clarify sandbody distribution patterns and hydrocarbon accumulation model of the Baijiantan formation in the Mahu sag, Junggar basin, and evaluate its hydrocarbon exploration prospects, the drilling, logging, seismic and experimental data were comprehensively analyzed to understand the sedimentary patterns and hydrocarbon accumulation characteristics of the second member of the Baijiantan formation (Bai-2 member). It is found that the Bai-2 member represents a braided-river delta-beach bar-turbidite fan sedimentary sequence, with three types of sandbodies of underwater distributary channel, beach bar and turbidite fan. Channel sandbodies are dominant in braided-river delta front; beach bar sandbodies are developed in shore-shallow lake; controlled by slope breaks, multiple turbidite fans are developed in deep lake to semi-deep lake, with turbidite fan sandbodies distributed in a lobate pattern. Thus, a sedimentary pattern of underwater distributary channel-beach bar-turbidite fan was established. Nine major strike-slip fault systems are found in the study area. Among them, three types of fault combinations such as through-type, associated-type, and relay-type strike-slip faults effectively connect the Permian Fengcheng formation source rocks and serve as efficient vertical pathways for hydrocarbon migration. The Bai-2 member follows a hydrocarbon accumulation model characterized by strike-slip faults connecting source rocks, fault-sandbody configuration controlling reservoir, and hydrocarbon enrichment in high-quality reservoirs.

Key words: Junggar basin, Mahu sag, Triassic, Baijiantan formation, sedimentary pattern, hydrocarbon accumulation, main controlling factor

CLC Number:

TE122.1

BIAN Baoli, SU Dongxu, JIANG Wenlong, WANG Xueyong, PAN Jin, LIU Longsong, JIANG Zhongfa. Exploration Breakthrough and New Insights of Baijiantan Formation in Mahu Sag and Its Periphery[J]. Xinjiang Petroleum Geology, 2024, 45(3): 296-305.

Figures/Tables 10

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