摘要
为了厘清制约川西南部地区下二叠统的油气来源问题,基于该地区下二叠统储层沥青、天然气成因鉴定和沥青、天然气与相关源岩三者对比,结合地质条件分析,研究其油气主要来源。沥青、天然气成因鉴定表明,川西南部地区储层沥青为原油裂解后的残渣,下二叠统天然气属于原油裂解气,储层沥青、天然气成因的相关性说明其可以共同指示川西南部地区下二叠统油气的来源。通过大深1井下二叠统储层沥青生标特征与相关源岩对比、不同地区层位之间天然气特征对比、天然气与源岩碳同位素对比,得出储层沥青、天然气来源具有一致性,"筇竹寺组泥岩来源为主,下二叠统泥灰岩来源为辅"是川西南部地区下二叠统天然气来源的合理解释。
In order to clarify the source of oil and gas in the lower Permian in southwest Sichuan,the main source of oil and gas is studied based on the genetic identification of bitumen and natural gas in the lower Permian reservoir,the correlation between bitumen and natural gas and related source rocks and the analysis of geological conditions.The genetic identification of the bitumen and natural gas in the lower Permian reservoir in southwest Sichuan shows that the bitumen is the residue of crude oil cracking,and the natural gas belongs to crude oil cracking gas.The correlation between the genesis of the bitumen and the natural gas indicates the source of Lower Permian hydrocarbon in southwest Sichuan.Through the in-depth comparison of the biomarker characteristics of Lower Permian reservoir asphalt in well Dashen1 and related source rocks,the comparison of the natural gas characteristics of different layers in different areas,and the comparison of the carbon isotope of natural gas and source rock,it is concluded that the source of the asphalt and the natural gas is consistent, "Qiongzhusi formation mudstone is their main source,and the Lower Permian marlite is their seconday source",which is the reasonable explanation of the source of the Lower Permian natural gas in southwest Sichuan.
作者
董才源
刘满仓
李德江
谢增业
杨春龙
国建英
张璐
DONG Caiyuan;LIU Mancang;LI Dejiang;XIE Zengye;YANG Chunlong;GUO Jianying;ZHANG Lu(Research Institute of Petroleum Exploration and Development,CNPC,Langfang,Hebei 065007,China)
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2020年第5期1-8,共8页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家科技重大专项(2016ZX05007-002)。
关键词
油气来源
筇竹寺组泥岩
泥灰岩
下二叠统
川西南部
oil and gas source
Qiongzhusi Formation mudstone
Marlite Lower Permian
southwest Sichuan Basin
