| 元坝地区长兴组储层溶蚀作用期次与机制研究 |
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| 引用本文： | 李国蓉,武恒志,叶斌,刘正中,彭博,吴亚军,彭光明,朱永源.元坝地区长兴组储层溶蚀作用期次与机制研究[J].岩石学报,2014,30(3):709-717. |
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| 作者姓名： | 李国蓉 武恒志 叶斌 刘正中 彭博 吴亚军 彭光明 朱永源 |
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| 作者单位： | 油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059;中石化西南油气分公司, 成都 610016;油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059;中石化西南油气分公司, 成都 610016;中国石油华北油田勘探开发研究院, 任丘 062552;中石化西南油气分公司, 成都 610016;中石化西南油气分公司, 成都 610016;油气藏地质及开发工程国家重点实验室, 成都理工大学, 成都 610059 |
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| 基金项目： | 本文受国家自然科学基金项目（41272150/D0207）、国家重大科技专项（2011ZX05005-002） 和地调项目（1212011220757）联合资助. |
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| 摘 要： | 溶蚀作用是元坝地区长兴组碳酸盐岩储层形成的关键,本文通过区内长兴组岩芯及岩石薄片观察,岩石学特征与地球化学特征研究充分结合,认为元坝地区长兴组储层存在着三期溶蚀作用,不同期次溶蚀作用产物的岩石学特征和地球化学特征明显有别。第Ⅰ期溶蚀作用发生于同生期-成岩早期,成岩流体为海岸带大气降水,遵循高频层序界面、层序不整合界面、礁滩控制的大气水溶蚀作用机制;第Ⅱ期溶蚀作用发生于晚三叠世-中侏罗世的埋藏过程中,相当于中成岩早期阶段,成岩流体为上二叠统地层内部流体,溶蚀作用与烃源岩系有机质热演化释放的有机酸进入成岩流体有关;第Ⅲ期溶蚀作用发生于晚白垩世-古近纪的埋藏过程中,相当于成岩晚期阶段,成岩流体为长兴组地层内部来源或中下三叠统来源流体,或为深部热液流体,溶蚀作用遵循深埋藏条件下构造作用驱动的多类型溶蚀作用机制。第Ⅰ期、第Ⅱ期溶蚀作用形成的储渗空间对于液态原油运移进入长兴组聚集成藏(古油藏)具有重要意义,第Ⅲ期溶蚀作用形成的储渗空间对于现今天然气成藏具有重要意义。
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| 关 键 词： | 元坝地区 长兴组 储层 溶蚀作用 储集意义 |
| 收稿时间： | 2013/6/16 0:00:00 |
| 修稿时间： | 1/2/2014 12:00:00 AM |
Stages and mechanism of dissolution in Changhsing reservoir, Yuanba area |
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| LI GuoRong,WU HengZhi,YE Bin,LIU ZhengZhong,PENG Bo,WU YaJun,PENG GuangMing and ZHU YongYuan.Stages and mechanism of dissolution in Changhsing reservoir, Yuanba area[J].Acta Petrologica Sinica,2014,30(3):709-717. |
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| Authors: | LI GuoRong WU HengZhi YE Bin LIU ZhengZhong PENG Bo WU YaJun PENG GuangMing and ZHU YongYuan |
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| Institution: | State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;Southwest Petroleum Branch, Sinopec, Chengdu 610016, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;Southwest Petroleum Branch, Sinopec, Chengdu 610016, China;Exploration and Development Research Institute of PetroChina Huabei Oilfield Company, Renqiu 062552, China;Southwest Petroleum Branch, Sinopec, Chengdu 610016, China;Southwest Petroleum Branch, Sinopec, Chengdu 610016, China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China |
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| Abstract: | Dissolution is the key diagenesis to Changhsing reservoir in the Upper Permian, Yuanba area. In this paper, based on the data of cores and thin section, synthesized petrology feature and geochemical feature analysis, it is conculuded that there are 3 stages of dissolution could be divided, whose petrology and geochemical feature are different with each other. The 1st stage of dissolution develops during the syndiagenesis and the early stage of diagenesis, where the diagenetic fluid consists of coastal atmospheric precipitation, related to high frequency sequence interface, sequence unconformity and the distribution of reef and shoal; The 2nd stage of dissolution is in the early middle period of diagenesis, when burial diagenesis happened in Late to Middle Jurassic, the diagenetic fluid consists of Upper Permian interior fluid, when the diagenesis fluid mixed by thermal aliphatic acid from thermal evolution of organic matter in source rock; The 3rd stage of dissolution in the later period of diagenesis when burial diagenesis happened in the Late Cretaceous to the Tertiary. The diagenetic fluid consists of the interior fluid of Changhsing Formation or Middle/Lower Triassic fluid, or the deep hydrothermal fluid, which is derived by multiple dissolution merchanism related to tectonism when in deep burial. The reservoir space related to the 1st and the 2nd stage of dissolution are greatly significant for oil migration in Changhsing Formation and accumulation (paleo-oil reservoir), the reservoir space related to the 3rd stage of dissolution diagenesis contributes greatly to present gas accumulation. |
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| Keywords: | Yuanba area Changhsing Formation Reservoir Dissolution Significance of accumulation |
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