准噶尔盆地沙湾凹陷西斜坡上乌尔禾组油藏成藏模式新认识

doi:10.7657/XJPG20240203

摘要/Abstract

摘要：

2018年，在精细刻画古地貌的基础上划分准噶尔盆地沙湾凹陷上二叠统上乌尔禾组沉积相，以“沟槽控砂、相控储集层”的成藏模式部署上钻沙探1井首获突破。但由于沉积相和储集层研究不足，沙探1井钻遇的储集层规模未达预期，成藏模式还需要进一步完善。因此，利用地震、录井、测井、岩心和地球化学等资料对沙湾凹陷上乌尔禾组沉积相和储集层特征进行系统研究。结果表明：沙湾凹陷发育小拐扇和沙门子扇2个沉积体系，沙门子扇规模更大，发育退覆式扇三角洲沉积相；上乌尔禾组从下至上分为3段，其中，乌二段薄砂层、乌一段上砂组下部和下砂组上部砂砾岩为主要的储集体；上乌尔禾组发育孔隙-裂缝双重介质型储集层；通源断裂为油气输送提供优势通道。建立了“断裂通源、扇控储集层、裂缝控产”成藏模式，发现了沙湾凹陷西斜坡断层-岩性油藏和断层-地层油藏，拓展了上乌尔禾组的油气勘探领域。

关键词: 准噶尔盆地, 沙湾凹陷, 二叠系, 上乌尔禾组, 勘探历程, 退覆式沉积, 成藏模式

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

中图分类号:

TE122.1

熊婷, 刘宇, 陈文利, 仲伟军, 贾春明, 姜涛, 尚春. 准噶尔盆地沙湾凹陷西斜坡上乌尔禾组油藏成藏模式新认识[J]. 新疆石油地质, 2024, 45(2): 151-162.

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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