岩性油气藏 ›› 2023, Vol. 35 ›› Issue (1): 108–119.doi: 10.12108/yxyqc.20230110

• 地质勘探 • 上一篇    

川东地区侏罗系自流井组大安寨段致密储层油气成藏特征

谢瑞1,2, 张尚锋1,2, 周林3, 刘皓天3, 姚明君3, 蒋雪桂1,2   

  1. 1. 长江大学 油气资源与勘探技术教育部重点实验室, 武汉 430100;
    2. 长江大学 地球科学学院, 武汉 430100;
    3. 中国石化 江汉油田分公司 勘探开发研究院, 武汉 430070
  • 收稿日期:2021-10-13 修回日期:2022-04-11 发布日期:2023-01-06
  • 通讯作者: 张尚锋(1964-),男,博士,教授,博士生导师,主要从事沉积学与层序地层学方面的教学和研究工作。Email:jpuzhangsf@163.com。 E-mail:jpuzhangsf@163.com
  • 作者简介:谢瑞(1988-),女,硕士,主要从事非常规油气勘探方面的研究。地址:(430050)湖北省武汉市汉阳区连通港西路。Email:1012916766@qq.com
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”课题三任务六“中扬子页岩气潜力分析与目标评价”(编号: 2017ZX05036003-008)、中国石油化工股份有限公司技术开发项目“川东北地区自流井组页岩气富集主控因素与有利目标”(编号: P19017-2)和中国石油化工股份有限公司“十条龙”科技项目“复兴侏罗系陆相页岩油气藏地质评价技术”(编号: P21078-2)联合资助

Hydrocarbon accumulation characteristics of tight reservoirs of Da'anzhai member of Jurassic Ziliujing Formation in eastern Sichuan Basin

XIE Rui1,2, ZHANG Shangfeng1,2, ZHOU Lin3, LIU Haotian3, YAO Mingjun3, JIANG Xuegui1,2   

  1. 1. Key Laboratory of Exploration Technology for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    2. School of Geosciences, Yangtze University, Wuhan 430100, China;
    3. Research Institute of Exploration and Production, Jianghan Oilfield Company, Sinopec, Wuhan 430070, China
  • Received:2021-10-13 Revised:2022-04-11 Published:2023-01-06

摘要: 川东地区侏罗系自流井组大安寨段具有“近源成藏”特征。通过烃源岩评价、流体包裹体分析、埋藏史恢复等方法,对川东地区侏罗系自流井组大安寨段储层特征与油气成藏进行了研究。研究结果表明: ①川东地区侏罗系自流井组大安寨段泥页岩有机质类型主要为Ⅱ型,实测残余有机碳质量分数平均为0.67%,生烃潜量为1.53mg/g,有机质热演化程度为1.1%~1.3%,总体上,大安寨段烃源岩有机质丰度中等偏下,处于生烃高峰期。②研究区大一亚段岩性以介壳灰岩和灰岩为主,构造缝为最主要的储集空间类型,其次为沿构造缝发育的溶孔(洞)、溶蚀微孔,储层物性较差,为特低孔特低渗储层。③研究区大安寨段油气藏存在2期原油充注和1期天然气充注,2期原油充注时间分别为距今约140Ma和25Ma,其中第一期为相对低成熟度的原油充注,第二期为相对高成熟度的原油充注,且后者为主要充注期,天然气充注时间与第二期原油充注时间一致,主要为原油伴生气。

关键词: 致密储层, 油气成藏, 油气充注, 介壳灰岩, 大安寨段, 自流井组, 侏罗系, 川东地区

Abstract: The Da’anzhai member of Jurassic Ziliujing Formation in eastern Sichuan Basin has the typical characteristics of near-source hydrocarbon accumulation. By means of source rock evaluation,fluid inclusion analysis and burial history recovery,the reservoir characteristics and hydrocarbon accumulation of Da’anzhai member of Jurassic Ziliujing Formation in eastern Sichuan were studied. The results show that: (1) The organic matters of Da’anzhai member of Jurassic Ziliujing Formation in eastern Sichuan Basin are mainly type Ⅱ. The measured residual organic carbon mass fraction is 0.67%,the hydrocarbon generation potential is 1.53 mg/g,and the thermal evolution degree of organic matter is 1.1%-1.3%. On the whole,the source rocks of Da’anzhai member have medium to low abundance of organic matters,which is at the peak of hydrocarbon generation. (2) The lithologies of the first submember of Da’anzhai member in the study area are mainly shell limestone and limestone,and the structural fractures are the main reservoir space,followed by dissolved pores (caves) and dissolved micropores developed along the structural fracture. The reservoirs have poor physical properties with ultra-low porosity and ultra-low permeability. (3) There are two stages of crude oil charging and one stage of natural gas charging in the reservoirs of Da’anzhai member in the study area. The two stages of crude oil charging time are about 140 Ma and 25 Ma respectively. The first stage is relatively low maturity crude oil charging,the second stage is relatively high maturity crude oil charging,and the latter is the main charging period. The natural gas charging time is the same as the second stage of crude oil charging,which is mainly associated gas of crude oil.

Key words: tight reservoir, hydrocarbon accumulation, oil and gas charging, shell limestone, Da’anzhai member, Ziliujing Formation, Jurassic, eastern Sichuan Basin

中图分类号: 

  • TE122
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