Genesis types and distribution of crude oil in Fukang Sag and its peripheral bulges, Junggar Basin

doi:10.3969/j.issn.1672-7703.2023.01.009

Abstract

Abstract: In order to identify the genesis and distribution of crude oil in Fukang Sag and its peripheral bulges in Junggar Basin, the latest geochemical data of source rocks and crude oil as well as petroleum exploration data are used to evaluate the geochemical characteristics of various source rocks, which enable to divide the genesis of crude oil into four types, clarify the genetic relationship between crude oil and source rocks,and determine the spatial distribution of crude oil with different genesis types. The study results show that type Ⅰ crude oil was mainly generated by source rocks of the Middle Permian Lucaogou Formation and distributed in Shanan, Beisantai, and Santai oilfields and deep formation of the Permian-Triassic in Fukang Sag; Type Ⅱ crude oil was generated by source rocks of the Lower Jurassic Badaowan Formation, and distributed in Shabei Oilfield, Fubei and Fudong slopes and the Jurassic in the sag; Type Ⅲ crude oil was the mixture generated by the Permian and Jurassic source rocks and distributed in the Jurassic in Cainan Oilfield and west Cainan block, as well as the western slope of Beisantai Bulge; Type Ⅳ crude oil was generated by source rocks of B member of the Carboniferous Songkaersu Formation, and mainly distributed in Fukang Sag and the adjacent bulges.The oil and gas generated by the Permian source rocks in Fukang Sag mostly accumulated in high-quality reservoirs and seal assemblage of the Permian and Lower Triassic, showing great exploration potential.

CLC Number:

TE112.1

Liu Deguang, Wang Yutao, Yang Haibo, Li Shihong, Liu Chaowei, Han Yang, Chen Mengna. Genesis types and distribution of crude oil in Fukang Sag and its peripheral bulges, Junggar Basin[J]. China Petroleum Exploration, 2023, 28(1): 94-107.

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