New Understanding of Hydrocarbon Accumulation Model of Upper Wuerhe Formation on Western Slope of Shawan Sag, Junggar Basin

doi:10.7657/XJPG20240203

Abstract

Abstract:

In 2018, based on a detailed characterization of paleogeomorphology, the sedimentary facies of the upper Wuerhe formation on the western slope of Shawan sag, Junggar basin, were identified, and a breakthrough was achieved by deploying Well ST 1 according to the hydrocarbon accumulation model of “trough-controlled sandbody, facies-controlled reservoir”. However, due to insufficient research on sedimentary facies and reservoirs, the reservoirs encountered by Well ST 1 didn’t meet the expectation in scale, with the hydrocarbon accumulation model to be clarified. In this paper, using the seismic, logging, core, and geochemical data, the sedimentary facies and reservoirs of the upper Wuerhe formation on the western slope of the Shawan sag were systematically investigated. The results show that two sedimentary systems, i.e., Xiaoguai fan and Shamenzi fan, are developed in the Shawan sag. Shamenzi fan which is larger in scale is characterized by retrogradational fan delta sedimentary facies. The upper Wuerhe formation (P₃w) can be divided into three members such as P₃w₁, P₃w₂ and P₃w₃ from bottom to top. The thin sand layers in P₃w₂, and the glutenites in the lower part of the upper P₃w₁ and the upper part of the lower P₃w₁ are the main reservoirs. Dual-porosity reservoirs are developed in the upper Wuerhe formation, and the faults connected to source rocks provide dominant pathways for oil and gas migration. A hydrocarbon accumulation model of “fault-connected source, fan-controlled reservoir, and fracture-controlled production” was established. Accordingly, fault-lithologic reservoirs and fault-stratigraphic reservoirs have been discovered on the western slope of the Shawan sag, expanding the exploration area in the upper Wuerhe formation.

Key words: Junggar basin, Shawan sag, Permian, upper Wuerhe formation, exploration history, retrogradational sedimentation, hydrocarbon accumulation model

CLC Number:

TE122.1

XIONG Ting, LIU Yu, CHEN Wenli, ZHONG Weijun, JIA Chunming, JIANG Tao, SHANG Chun. New Understanding of Hydrocarbon Accumulation Model of Upper Wuerhe Formation on Western Slope of Shawan Sag, Junggar Basin[J]. Xinjiang Petroleum Geology, 2024, 45(2): 151-162.

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