| 川东北二叠系长兴组碳酸盐岩深埋成岩过程及其意义 |
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| 引用本文： | 张单明,刘波,秦善,田永净,张学丰,郭荣涛.川东北二叠系长兴组碳酸盐岩深埋成岩过程及其意义[J].岩石学报,2017,33(4):1295-1304. |
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| 作者姓名： | 张单明 刘波 秦善 田永净 张学丰 郭荣涛 |
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| 作者单位： | 北京大学地球与空间科学学院, 北京 100871;北京大学石油与天然气研究中心, 北京 100871,北京大学石油与天然气研究中心, 北京 100871,北京大学地球与空间科学学院, 北京 100871,中联煤层气有限责任公司, 北京 100011,北京大学石油与天然气研究中心, 北京 100871,北京大学地球与空间科学学院, 北京 100871;北京大学石油与天然气研究中心, 北京 100871 |
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| 基金项目： | 本文受国家自然科学基金项目（41572117）和国家科技重大专项专题（2011ZX05005-003-010HZ）联合资助. |
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| 摘 要： | 上二叠统长兴组储层是川东北地区主力产层之一,储层岩性主要为结晶白云岩、残余生屑/砂屑白云岩、生物礁白云岩和亮晶生屑灰岩,储集空间以晶间孔、晶间溶孔为主,生物体腔孔、残余粒间孔次之,溶洞和裂缝少量发育。长兴组优质储层主要分布于台地边缘生物礁、台地边缘滩等沉积相带,该相带发育大量原生孔隙,易遭受大气淡水溶蚀改造。原生孔隙的发育为白云岩化流体与岩石相互作用提供空间,早期孔隙演变为晶间孔。白云岩抗压实能力较强,有利于高孔隙白云岩的保存。早三叠世快速深埋使长兴组迅速进入中深埋藏,深埋阶段,裂缝少量发育,部分被方解石充填,对储层贡献有限。晚三叠世油气充注隔绝了岩石与地层水的接触,抑制了孔隙内白云石的溶蚀和沉淀,储层先存孔隙得到较好的保存。快速深埋使孔隙迅速被埋藏封闭,深埋阶段水-岩反应处于近封闭的平衡状态,溶蚀-沉淀现象有限,深埋藏环境主要是储层孔隙保存和调整的场所,孔隙空间的位置可能重新分配。
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| 关 键 词： | 川东北 长兴组 碳酸盐岩 深埋 孔隙保存 |
| 收稿时间： | 2016/5/1 0:00:00 |
| 修稿时间： | 2016/8/5 0:00:00 |
Deeply buried diagenetic process and its significance for the carbonate of Changxing Formation in the northeastern Sichuan Basin |
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| ZHANG ShanMing,LIU Bo,QIN Shan,TIAN YongJing,ZHANG XueFeng and GUO RongTao.Deeply buried diagenetic process and its significance for the carbonate of Changxing Formation in the northeastern Sichuan Basin[J].Acta Petrologica Sinica,2017,33(4):1295-1304. |
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| Authors: | ZHANG ShanMing LIU Bo QIN Shan TIAN YongJing ZHANG XueFeng and GUO RongTao |
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| Institution: | School of Earth and Space Sciences, Peking University, Beijing 100871, China;Institute of Oil and Gas, Peking University, Beijing 100871, China,Institute of Oil and Gas, Peking University, Beijing 100871, China,School of Earth and Space Sciences, Peking University, Beijing 100871, China,China United Coalbed Methane Corporation, Ltd, Beijing 100011, China.,Institute of Oil and Gas, Peking University, Beijing 100871, China and School of Earth and Space Sciences, Peking University, Beijing 100871, China;Institute of Oil and Gas, Peking University, Beijing 100871, China |
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| Abstract: | The Upper Permian Changxing Formation, one of the main reservoirs in the northeastern Sichuan Basin is made up of crystalline dolomite, residual bioclastic/sand-clastic dolomite, biohermal dolomite and sparry bioclastic limestone. Observations on the thin sections display that the reservoir space is mainly made up of intercrystalline pore and intercrystalline solution pore, followed by biological cavity pore and residual intergranular pore, with a few caves and fractures. The high quality reservoir of Changxing Formation mainly develops in the platform margin reef facies and shoal facies which prefer to develop abundant primary pores and suffer meteoric dissolution first. The primary pores provide space for the interaction between the dolomitization fluid and carbonate during diagenetic process. The eogenetic pores transform into intercrystalline pores. Dolomite is more likely to preserve high porosity for its high anti-compaction feature. Fast deeply buried in the Early Triassic makes Changxing Formation reach the middle-deep burial stage quickly. During the deep burial stage, fractures are less developed in the study area, which has a minor effect on Changxing Formation. Hydrocarbon emplacement in the Late Triassic isolates the contact between the carbonate and the pore fluid, which restrains the dissolution and cementation of the dolomite within the pores. The pre-existed pores are well preserved. Early fast deeply buried makes the early pores get into the closed system in a short time. The carbonate-fluid reaction reaches an equilibrium state in a nearly closed system in the deep burial stage, resulting in limited dissolution and cementation. Deep burial environment is the setting for porosity modification and preservation. It is just a redistribution of the pore space. |
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| Keywords: | Northeastern Sichuan Basin Changxing Formation Carbonate Deep burial Pore preservation |
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