伊陕斜坡吴起地区延长组油气成藏期次分析

doi:10.12108/yxyqc.20210603

岩性油气藏 ›› 2021, Vol. 33 ›› Issue (6): 21–28.doi: 10.12108/yxyqc.20210603

• 油气地质 • 上一篇

伊陕斜坡吴起地区延长组油气成藏期次分析

李博¹, 崔军平^1,2, 李莹³, 李金森⁴, 赵金⁵, 陈彦武¹

1. 西北大学地质学系, 西安 710069;
2. 西北大学大陆动力学国家重点实验室, 西安 710069;
3. 中国石油长庆油田分公司第六采气厂, 西安 710000;
4. 中国石油长庆油田分公司第一采气厂, 西安 710069;
5. 中国石油长庆油田分公司第三采油厂, 银川 750003

收稿日期:2021-03-22 修回日期:2021-06-01 发布日期:2021-11-25
通讯作者: 崔军平(1978-),男,西北大学副教授,博士生导师,主要从事盆地热演化史与油气成藏相关教学与科研工作。Email:cuijp@nwu.edu.cn。 E-mail:cuijp@nwu.edu.cn
作者简介:李博(1996-),男,西北大学在读硕士研究生,主要研究方向为油气成藏。地址:西安市碑林区太白北路229号。Email:1072505008@qq.com
基金资助:
国家自然科学基金面上项目“热年代学约束下松辽盆地石炭二叠系构造热演化史恢复”（编号：41772121）、国家自然科学基金重点项目“鄂尔多斯、沁水沉积盆地中生代晚期古地温场对岩石圈动力学演化及油气赋存的约束作用”（编号：41630312）和国家重点研发计划“课题超深层及中新元古界油气成藏富集规律与勘探方向”（编号：2017YFC0603106）联合资助

Hydrocarbon accumulation phases of Yanchang Formation in Wuqi area, Yishan slope

LI Bo¹, CUI Junping^1,2, LI Ying³, LI Jinsen⁴, ZHAO Jin⁵, CHEN Yanwu¹

1. Department of Geology, Northwest University, Xi'an 710069, China;
2. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China;
3. No.6 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710000, China;
4. No.1 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi'an 710069, China;
5. No.3 Oil Production Plant, PetroChina Changqing Oilfield Company, Yinchuan 750003, China

Received:2021-03-22 Revised:2021-06-01 Published:2021-11-25

摘要/Abstract

摘要： 伊陕斜坡是鄂尔多斯盆地重要的产油气区，油气成藏期次研究有助于判断三叠系油藏成藏过程及油藏的分布规律。为了确定三叠系延长组油气成藏期次，基于流体包裹体均一温度-埋藏史间接投影定年法，开展了系统的储层流体包裹体特征分析。结果表明：①鄂尔多斯盆地伊陕斜坡吴起地区三叠系延长组长4+5、长6储层主要为盐水包裹体和含液态烃包裹体，形态以椭球状-球状为主。②均一温度分析表明第1期与油气伴生的盐水包裹体均一温度主峰为90～100 ℃；第2期伴生的盐水包裹体均一温度主峰为130～140 ℃。③基于盐水包裹体的盐度、成分、盆地热演化史结果及储层伊利石K-Ar同位素定年结果分析，伊陕斜坡吴起地区延长组存在2期油气充注：第1期为早白垩世中期，距今130～115 Ma；第2期为早白垩世晚期，距今108～96 Ma。2次油气充注表明鄂尔多斯盆地伊陕斜坡延长组油气成藏时期为早白垩世（130～96 Ma）。该认识可为吴起及相邻地区三叠系油气勘探开发提供依据。

关键词: 流体包裹体, 均一温度, 成藏期次, 三叠系, 伊陕斜坡, 鄂尔多斯盆地

Abstract: Yishan slope is an important oil and gas producing area in Ordos Basin. The study of hydrocarbon accumulation phases is helpful to judge the accumulation process and distribution of Triassic reservoirs. To clarify the hydrocarbon accumulation phases of Chang 4+5 and Chang 6 reservoirs of Triassic Yanchang Formation, a systematic analysis of reservoir fluid inclusion characteristics was carried out based on homogenization temperature and authigenic mineral(illite) K-Ar isotopic dating of the inclusions-burial history indirect projection dating method. The results show that: (1) The Chang 4+5 and Chang 6 reservoirs of Triassic Yanchang Formation in Wuqi area of Yishan slope are mainly composed of brine inclusions and liquid hydrocarbon inclusions, and the shape is mainly ellipsoid-spheroid. (2) Homogenization temperature analysis shows that the reservoir inclusions can be divided into two phases: the main homogenization temperature peaks of the brine inclusions in the first and second phases are 90-110 ℃ and 120-140 ℃ respectively. (3) Based on the analyses of salinity and composition of the inclusions, thermal evolution history of the basin and K-Ar isotopic dating of reservoir illite, there are two stages of hydrocarbon charging in Chang 4+5 and Chang 6 reservoirs: the first stage is the middle Early Cretaceous(130-115 Ma); the second stage is the late Early Cretaceous(108-96 Ma). The two stages of hydrocarbon charging indicate that the hydrocarbon accumulation phase of Yanchang Formation in Yishan slope is Early Cretaceous(130-96 Ma). This understanding provides a basis for the exploration and development of Triassic oil and gas in Wuqi and its adjacent areas.

Key words: fluid inclusion, homogenization temperature, hydrocarbon accumulation phases, Triassic, Yishan slope, Ordos Basin

中图分类号:

TE121.3

李博, 崔军平, 李莹, 李金森, 赵金, 陈彦武. 伊陕斜坡吴起地区延长组油气成藏期次分析[J]. 岩性油气藏, 2021, 33(6): 21–28.

LI Bo, CUI Junping, LI Ying, LI Jinsen, ZHAO Jin, CHEN Yanwu. Hydrocarbon accumulation phases of Yanchang Formation in Wuqi area, Yishan slope[J]. Lithologic Reservoirs, 2021, 33(6): 21–28.

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伊陕斜坡吴起地区延长组油气成藏期次分析

Hydrocarbon accumulation phases of Yanchang Formation in Wuqi area, Yishan slope

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