川东卧新双地区天然气特征及上三叠统须家河组天然气来源

doi:10.11743/ogg20170510

石油与天然气地质 ›› 2017, Vol. 38 ›› Issue (5): 913-921.doi: 10.11743/ogg20170510

川东卧新双地区天然气特征及上三叠统须家河组天然气来源

林世国¹, 王昌勇², 易士威¹, 高阳¹, 李明鹏¹, 李世宁³, 李爽³

1. 中国石油勘探开发研究院天然气地质研究所, 河北廊坊 065007;
2. 成都理工大学沉积地质研究院油气藏地质及开发工程国家重点实验室, 四川成都 610059;
3. 中国石油西南油气田分公司重庆气矿, 重庆 400021

收稿日期:2016-12-10 修回日期:2017-08-08 出版日期:2017-10-28 发布日期:2017-11-10
通讯作者: 王昌勇(1981-),男,博士、副教授,沉积学及石油地质。E-mail:wangchangyong09@cdut.cn E-mail:wangchangyong09@cdut.cn
作者简介:林世国(1980-),男,博士、高级工程师,油气地质。E-mail:linshiguo69@petrochina.com.cn。
基金资助:
国家科技重大专项（2016ZX05007）。

Analyses of features and source of natural gas in the Upper Triassic Xujiahe Formation,Woxinshuang area,eastern Sichuan Basin

Lin Shiguo¹, Wang Changyong², Yi Shiwei¹, Gao Yang¹, Li Mingpeng¹, Li Shining³, Li Shuang³

1. Department of Natural Gas Geology, Research Institute of Petroleum Exploration and Development, PetroChina, Langfang, Hebei 065007, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
3. Chongqing Gas Producer, PetroChina Southwest Oil & Gas Field Company, Chongqing 400021, China

Received:2016-12-10 Revised:2017-08-08 Online:2017-10-28 Published:2017-11-10

摘要/Abstract

摘要： 天然气来源分析是一个重要的石油地质问题，直接关系到勘探决策。四川盆地川东地区须家河组勘探和开发相对滞后，基础地质研究的欠缺导致卧新双地区须家河组天然气的来源一直存在争议。天然气组分及碳同位素分析结果表明：卧新双地区须家河组天然气具有甲烷含量较低、重烃含量较高、干燥系数较低等特点；天然气中甲烷碳同位素值δ¹³C₁<-40‰，具有δ¹³C₃ > δ¹³C₂ > δ¹³C₁的特征；须家河组天然气为干酪根初次裂解的陆相油型气和混合气；须家河组天然气目前主要处于成熟-高成熟的湿气阶段。卧新双地区须家河组暗色泥岩较为发育，有机地球化学分析结果表明：须家河组泥岩主要以Ⅱ₁和Ⅱ₂型干酪根为主，具有较高的有机碳含量和氯仿沥青“A”含量，总体具有较好的生烃能力，泥岩中有机质处于成熟-高成熟的湿气阶段。卧新双地区须家河组天然气成熟度与烃源岩成熟度相当，结合须家河组天然气组分特征、同位素特征及成因类型等与下伏石炭系、茅口组、龙潭组、长兴组、飞仙关组、嘉陵江组及雷口坡组天然气存在明显区别，推测该区须家河组天然气主要为自生气。

关键词: 天然气, 须家河组, 上三叠统, 卧新双地区, 川东地区

Abstract: Source analysis of natural gas is one of the geological challenges involving exploration decision-making.Exploration and development of the Xuejiahe Formation in eastern Sichuan Basin is relatively lagged behind and the source of natural gas there is still a mystery due to the fact of lacking basic geological study.Gas composition and isotope analyses show that the natural gas from the Xuejiahe Formation of Woxinshuang area features in low content of methane,high content of heavy hydrocarbon,and lower aridity coefficient.The carbon isotope values were measured to be δ¹³C₁<-40‰ and δ¹³C₃ > δ¹³C₂ > δ¹³C₁.The gas from the Xuejiahe Formation is continental oil-type gas or mixed gas from primary cracking of kerogen and is now at the mature and highly mature wet gas stage.The Formation in the area has well deve-loped dark mudstone.Organic geochemical analyses indicate a kerogen Ⅰ and Ⅱ dominated mudstone with high content of organic carbon and chloroform bitumen "A",indicating relatively high hydrocarbon generation potential.The organic matter of the mudstone was measured to be at the mature to highly mature wet gas stage.Gas from the Formation in the area has a maturity as same as that of source rocks.Combining this understanding with the gas composition and isotope analyses results,we suggest that the gas in the Xuejiahe Formation is mostly autogeneous gas and differs utterly from that in the underlying Carboniferous,the Maokou,the Longtan,the Changxing,the Feixianguan,the Jialinjiang and the Leikoupo Formations.

Key words: natural gas, Xujiahe Formation, Upper Triassic, Woxinshuang area, eastern Sichuan Basin

中图分类号:

TE121.1

林世国,王昌勇,易士威,等. 川东卧新双地区天然气特征及上三叠统须家河组天然气来源[J]. 石油与天然气地质, 2017, 38(5): 913-921. doi: 10.11743/ogg20170510 Lin Shiguo,Wang Changyong,Yi Shiwei,et al. Analyses of features and source of natural gas in the Upper Triassic Xujiahe Formation,Woxinshuang area,eastern Sichuan Basin[J]. Oil & Gas Geology, 2017, 38(5): 913-921. doi: 10.11743/ogg20170510

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川东卧新双地区天然气特征及上三叠统须家河组天然气来源

Analyses of features and source of natural gas in the Upper Triassic Xujiahe Formation,Woxinshuang area,eastern Sichuan Basin

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