| 阿克苏地区寒武系肖尔布拉克组不同白云岩的孔隙特征、成因及演化 |
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| 引用本文： | 王振宇,宁科科,屈海洲,胡安平,张云峰,陈薇,罗新生,张兴宇.阿克苏地区寒武系肖尔布拉克组不同白云岩的孔隙特征、成因及演化[J].沉积学报,2023,41(1):256-269. |
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| 作者姓名： | 王振宇 宁科科 屈海洲 胡安平 张云峰 陈薇 罗新生 张兴宇 |
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| 作者单位： | 1.西南石油大学地球科学与技术学院, 成都 610500 |
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| 基金项目： | 国家自然科学基金项目41702163国家自然科学基金项目41702122中国石油—西南石油大学创新联合体科技合作项目2020CX010301 |
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| 摘 要： | 根据阿克苏地区两条典型野外剖面（肖西沟剖面、苏盖特布拉克剖面）的细测及大量薄片资料分析,认为肖尔布拉克组发育凝块石云岩、残余颗粒云岩及晶粒云岩等3种类型白云岩,主要孔隙类型有晶间孔、晶间溶孔、粒间溶孔、凝块内溶孔等4种。凝块石云岩中孔隙面孔率与胶结物含量及单个凝块大小呈反比,孔隙的连通性与单个凝块大小、堆积疏松程度、胶结物含量、凝块含量呈正比。残余砂屑云岩孔隙面孔率与残余颗粒含量呈正比、与胶结物含量呈反比。根据沉积—成岩作用影响的差异,建立3种不同白云岩孔隙演化发育模式:在凝块石云岩中,同生—准同生期大气淡水溶蚀作用是形成孔隙的关键,埋藏期溶蚀作用使得孔隙进一步改善,最终形成以凝块内溶孔（占比72%）为主的孔隙类型；在残余颗粒云岩中,同生—准同生期的溶蚀作用是形成孔隙的基础,埋藏期溶蚀作用是增加有效孔隙的关键因素,最终形成以粒间溶孔（占比51%）为主的孔隙类型；在晶粒云岩中,早期的溶蚀改造作用对晶粒云岩孔隙发育影响较小,而埋藏期的扩大溶蚀作用是有效孔隙发育的关键因素,使其形成以晶间溶孔（占比62%）为主的孔隙类型。
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| 关 键 词： | 孔隙特征 孔隙成因 白云岩 肖尔布拉克组 阿克苏地区 |
| 收稿时间： | 2021-05-19 |
Pore Characteristics,Origin, and Evolution of Different Dolomites in the Cambrian Xiaoerbulak Formation in the Aksu Area |
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| Institution: | 1.Institute of Earth Science and Technology, Southwest Petroleum University, Chengdu 610500, China2.Research Division of Key Laboratory of Carbonate Reservoir, CNPC, Southwest Petroleum University,Chengdu 610500, China3.PetroChina Hangzhou Research Institute of Geology, Hangzhou 310023, China4.Research Institute of Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China |
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| Abstract: | Based on the investigation of two typical field sections （Xiaoxigou and Sugaitebulake） in the Aksu area and the analysis of a large number of thin section data, there are three types of dolomites in the Xiaoerbulak Formation: clotted, residual granular, and grain dolomite. There are four main types of pores: intercrystalline, intercrystalline dissolution, intergranular dissolution, and clot dissolution pores. In the clotted dolomite, the porosity is inversely proportional to the content of cement and the size of the single clotted. The connectivity of pores is proportional to the size of the single clotted, the degree of loose deposition, the content of cement and clotted. In the residual granular dolomite, the porosity is proportional to the residual particle content and inversely proportional to the content of cement. According to the difference effects of sedimentation - diagenesis, three different dolomite pore evolution models are established: In the clotted dolomite, the dissolution of meteoric water during the syngeneic-quasisyngeneic period is the key to pore formation, and the dissolution during the burial period further improves the pores, finally forming the dominant pore type clot dissolution pores （occupy 72%）. In residual granular dolomite, the dissolution during the syngenetic-quasi- syngenetic period is the basis for pore formation, and the dissolution during the burial period is the key factor increasing effective pores； finally, the dominant pore type is formed, intergranular dissolution pores （occupy 51%）. In the grained dolomite, the early dissolution transformation has little effect on the pore development, and the expansion of dissolution during the burial period is the key factor for effective pore development； therefore, the dominant pore type is intergranular dissolution pores （occupy 62%）. |
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