准噶尔盆地阜康凹陷及周缘凸起区的原油成因与分布

doi:10.3969/j.issn.1672-7703.2023.01.009

摘要/Abstract

摘要： 为进一步厘清准噶尔盆地阜康凹陷及周缘凸起区原油成因及其分布规律，基于最新烃源岩、原油有机地球化学和油气勘探资料，评价了各套烃源岩的地球化学特征，划分出4种成因原油类型，明确了原油与相应烃源岩的亲缘关系，查明了不同成因原油的空间分布。研究结果表明，Ⅰ类原油源自中二叠统芦草沟组烃源岩，主要分布在沙南、北三台、三台等油田和阜康凹陷深层二叠系—三叠系；Ⅱ类原油源自阜康凹陷下侏罗统八道湾组烃源岩，分布于沙北油田、阜北斜坡、阜东斜坡及该凹陷内侏罗系；Ⅲ类原油来自二叠系与侏罗系烃源岩的混合，分布于彩南油田、彩南西区块、北三台凸起西斜坡侏罗系; Ⅳ类原油源自石炭系松喀尔苏组B 段烃源岩，主要以出油点的形式分布于阜康凹陷与相邻凸起。阜康凹陷二叠系生成的油气聚集在自身及下三叠统相对优质储盖组合中，勘探潜力大。

关键词: 阜康凹陷, 烃源岩, 原油成因, 原油分布

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.

中图分类号:

TE112.1

刘得光, 王屿涛, 杨海波, 李世宏, 刘超威, 韩杨, 陈梦娜. 准噶尔盆地阜康凹陷及周缘凸起区的原油成因与分布[J]. 中国石油勘探, 2023, 28(1): 94-107.

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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