| 川中安岳构造寒武系龙王庙组油气成藏史 |
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| 引用本文： | 林雪梅,袁海锋,朱联强,曾伟,徐云强.川中安岳构造寒武系龙王庙组油气成藏史[J].地质学报,2020,94(3):916-930. |
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| 作者姓名： | 林雪梅 袁海锋 朱联强 曾伟 徐云强 |
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| 作者单位： | 1） 成都理工大学，油气藏地质及开发工程国家重点实验室，成都，610059,1） 成都理工大学，油气藏地质及开发工程国家重点实验室，成都，610059,1） 成都理工大学，油气藏地质及开发工程国家重点实验室，成都，610059,2） 西南石油大学，成都，610500,1） 成都理工大学，油气藏地质及开发工程国家重点实验室，成都，610059 |
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| 基金项目： | 本文为国家“973”项目（编号2012CB214805）和国家自然科学基金项目(编号41572133，41872130)资助的成果。 |
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| 摘 要： | 本文从岩芯和薄片观察入手,利用阴极发光分析、流体包裹体分析、激光拉曼分析、充填物的稳定同位素分析、磷灰石裂变径迹年代学分析等技术手段,确定了龙王庙组储层的胶结充填序列、油气成藏历史。龙王庙组储层中可以识别出7个期次的胶结充填序列:海底环境纤维状白云石胶结→浅埋藏环境粒状白云石胶结→表生成岩环境渗流粉砂白云石充填→再次浅埋藏-中埋藏环境白云石充填→深埋藏环境白云石充填→深埋藏环境方解石充填→抬升埋藏环境石英充填,通过所识别出的胶结充填物的流体包裹体特征以及和沥青之间的关系,认为龙王庙组存在至少5期油气成藏。第Ⅳ期白云石-第Ⅶ期石英中捕获的流体包裹体的相态也从液烃包裹体→气液两相烃类包裹体→气相烃类包裹体演化,反映了龙王庙组经历了古油藏形成、古油藏破坏、再次形成古油藏、油裂解为天然气、古气藏形成和喜马拉雅期构造隆升期气藏调整定型的过程;磷灰石裂变径迹分析表明,安岳构造喜马拉雅期的隆升幅度约1865~2030m,为龙王庙组气藏的调整和定型期,这一成藏事件被晚期充填的第Ⅶ期石英所记录。龙王庙组储层中第Ⅳ期白云石充填物的87Sr/86Sr、δ13C、δ18O同位素比值反映了该期白云石与围岩基质的重溶沉淀有关,且是在相对温度较高的埋藏条件下沉淀的。晚期孔洞缝中充填石英的87Sr/86Sr、δ30Si、δ18O同位素表明其主要源于含硅质的成岩流体,与深部幔源热液流体活动无关,龙王庙组油气成藏过程中未见外来破坏性流体的参与。
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| 关 键 词： | 油气成藏 流体包裹体 磷灰石裂变径迹 川中安岳构造 |
| 收稿时间： | 2019/9/29 0:00:00 |
| 修稿时间： | 2020/1/21 0:00:00 |
Hydrocarbon accumulation history of the Cambrian Longwangmiao Formation in the Anyue structure of the central Sichuan basin |
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| LIN Xuemei,YUAN Haifeng,ZHU Lianqiang,ZENG Wei and XU Yunqiang.Hydrocarbon accumulation history of the Cambrian Longwangmiao Formation in the Anyue structure of the central Sichuan basin[J].Acta Geologica Sinica,2020,94(3):916-930. |
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| Authors: | LIN Xuemei YUAN Haifeng ZHU Lianqiang ZENG Wei and XU Yunqiang |
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| Institution: | 1) State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059,1) State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059,1) State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059,2) School of Geoscience and Technology, Southwest Petroleum University, Chengdu, 610500 and 1) State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, 610059 |
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| Abstract: | This paper analyzes the cementation/filling sequences and hydrocarbon accumulation history of the Cambrian Longwangmiao Formation reservoir in the Anyue structure of the central Sichuan Basin by means of core and thin section observations,together with the cathodoluminescence analysis,fluid inclusion analysis,laser Raman analysis,stable isotope analysis on fillings,and apatite fission track dating.Seven stages of cementation/filling sequences are identified,i.e.,fibrous dolomite cementation in the submarine environment→granular dolomite cementation in the shallow-burial environment→vadose silty dolomite filling in the epidiagenesis environment→dolomite filling in the shallow-re-burial-moderate-burial environment→dolomite filling in the deep-burial environment→calcite filling in the deep-burial environment→quartz filling in the uplifting burial environment.The characteristics of fluid inclusions in the cements and fillings and their relationships with bitumen reveal at least 5 stages of hydrocarbon accumulation in the Longwangmiao Formation.The fluid inclusions captured in the StageⅣdolomite to the StageⅦquartz demonstrate the phases from liquid hydrocarbon inclusion to gas-liquid two-phase hydrocarbon inclusion and then to gas hydrocarbon inclusion,indicating that the Longwangmiao Formation has experienced the formation of paleooil reservoir,destruction of paleo-oil reservoir,re-formation of paleo-oil reservoir,cracking of oil into gas,formation of paleo-gas reservoir,and reworking and finalization of gas reservoir along with the structural uplifting in the Himalayan.The analysis on apatite fission track indicates that the Anyue structure was uplifted by 1865~2030 m in the Himalaya,contributing to the reworking and finalization of the Longwangmiao Formation gas reservoir,which is recorded by the StageⅦquartz.The 87 Sr/86 Sr,δ13 C andδ18 O of the Stage IV dolomite fillings in the Longwangmiao Formation reservoir reflect that the StageⅣdolomite is related to the re-dissolution and precipitation of the surrounding rock matrix,which occurred during burial at a relatively high temperature.The 87 Sr/86 Sr,δ30 Si andδ18O of the later quartz fillings in the pores,vugs and fractures indicate that the quartz was mainly derived from the silica-bearing diagenetic fluid and is independent of the activity of the mantle-derived hydrothermal fluid in the deep strata.The contribution of foreign destructive fluids to the hydrocarbon accumulation process is not found. |
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| Keywords: | hydrocarbon accumulation fluid inclusion apatite fission track Anyue structure of the central Sichuan basin |
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