New evidence of laser in-situ U-Pb dating and isotopic geochemistry for the genesis of dolomite reservoir: a case study of dolomite reservoir from Middle Permian Q ixia Formation in northwestern Sichuan Basin

doi:10.7623/syxb202202005

Acta Petrolei Sinica ›› 2022, Vol. 43 ›› Issue (2): 223-233.DOI: 10.7623/syxb202202005

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New evidence of laser in-situ U-Pb dating and isotopic geochemistry for the genesis of dolomite reservoir: a case study of dolomite reservoir from Middle Permian Q ixia Formation in northwestern Sichuan Basin

Pan Liyin^1,2, Hao Yi^1,2, Liang Feng^1,2, Hu Anping^1,2, Feng Yuexing³, Zhao Jianxin³

1. PetroChina Hangzhou Research Institute of Geology, Zhejiang Hangzhou 310023, China;
2. Key Laboratory of Carbonate Reservoirs, China National Petroleum Corporation, Zhejiang Hangzhou 310023, China;
3. Radiogenic Isotope Facility, School of Earth and Environmental Sciences, The University of Queensland, Brisbane QLD4072, Australia

Received:2020-05-21 Revised:2021-03-05 Published:2022-03-03

白云岩储层成因的激光原位U-Pb定年和同位素地球化学新证据——以四川盆地西北部中二叠统栖霞组白云岩储层为例

潘立银^1,2, 郝毅^1,2, 梁峰^1,2, 胡安平^1,2, 俸月星³, 赵建新³

1. 中国石油天然气股份有限公司杭州地质研究院浙江杭州 310023;
2. 中国石油天然气集团有限公司碳酸盐岩储层重点实验室浙江杭州 310023;
3. 昆士兰大学地球与环境科学学院放射性同位素实验室澳大利亚布里斯班 QLD4072

通讯作者: 潘立银,男,1981年6月生,2006年获南京大学硕士学位,现为中国石油天然气股份有限公司杭州地质研究院高级工程师,主要从事碳酸盐岩成岩作用研究。
作者简介:潘立银,男,1981年6月生,2006年获南京大学硕士学位,现为中国石油天然气股份有限公司杭州地质研究院高级工程师,主要从事碳酸盐岩成岩作用研究。Email:panly_hz@petrochina.com.cn
基金资助:
国家自然科学基金项目（No.42172183）和中国石油天然气股份有限公司科技研发项目（2021DJ0503）资助。

Abstract

Abstract: Taking the dolomite reservoir in Middle Permian Qixia Formation of northwest Sichuan Basin as an example, this paper analyses the genesis of vugs and intercrystalline pores in dolomite by means of laser in-situ U-Pb dating and carbon, oxygen and strontium isotope geochemistry. The host rock has similar U-Pb ages and carbon, oxygen and strontium isotope composition with the first generation of dolomite cements in the vugs, indicating that the vugs always existed before dolomitization, and also provided crystallization space for cement precipitation from dolomitization fluids. There are close spatial relationship, nearly consistent U-Pb age and isotope composition between tight allotriomorphic dolomite and porous euhedral dolomite, indicating that the crystalline morphology and intercrystalline pore development are controlled by texture of the host rock, and the intercrystalline pores are essentially the pores formed by the growth of euhedral dolomite in the loose area of the host rock and the adjustment of the original pore space. Based on the analysis of carbon isotope difference between reservoir and non-reservoir, it is concluded that meteoric leaching during early diagenesis is the key factor controlling the formation of reservoir space, and the main function of dolomitization is the inheritance and adjustment of existing pores and vugs in host rock.The constraint from U-Pb age can better eliminate the multiple interpretations of reservoir petrology and geochemistry, so as to get the most reasonable explanation for the genesis of reservoir space. The consistency of U-Pb ages between host rock and cements can be used as a potential index to identify the inherited pores in dolomite, which has an important application prospect in the study of reservoir genesis.

Key words: laser in-situ U-Pb dating, genesis of pore, dolomite, Qixia Formation, Sichuan Basin

摘要： 以四川盆地西北部中二叠统栖霞组白云岩储层为例，采用激光原位U-Pb定年和碳、氧、锶同位素地球化学分析手段对白云岩中的孔洞和晶间孔成因进行了研究。白云岩的围岩与孔洞中的第1期白云石胶结物具有相近的U-Pb年龄和相似的碳、氧、锶同位素组成，表明孔洞在白云石化作用之前就已存在，孔洞为白云石胶结物从白云石化流体中沉淀提供了空间。致密的他形交代白云石与多孔的自形交代白云石之间存在密切的空间关系以及近乎一致的U-Pb年龄和同位素地球化学组成，这表明晶体形态和晶间孔发育状况受原岩结构控制，晶间孔实质上为自形白云石在原岩结构疏松区域生长，调整原有孔隙空间后所形成的孔隙。通过分析储层与非储层之间碳同位素的差异认为，早成岩期的大气淡水溶蚀作用是储集空间形成的关键，白云石化作用主要表现为对原岩中已有孔隙和孔洞的继承和调整。U-Pb年龄的约束可较好地消除储层岩石学和地球化学分析的多解性，从而获得储集空间成因的最合理解释。围岩与胶结物之间U-Pb年龄的一致可作为识别白云岩中继承性孔隙的潜在指标，在储层成因研究中具有重要的应用前景。

关键词: 激光原位U-Pb定年, 孔隙成因, 白云岩, 栖霞组, 四川盆地

CLC Number:

TE122.2

Pan Liyin, Hao Yi, Liang Feng, Hu Anping, Feng Yuexing, Zhao Jianxin. New evidence of laser in-situ U-Pb dating and isotopic geochemistry for the genesis of dolomite reservoir: a case study of dolomite reservoir from Middle Permian Q ixia Formation in northwestern Sichuan Basin[J]. Acta Petrolei Sinica, 2022, 43(2): 223-233.

潘立银, 郝毅, 梁峰, 胡安平, 俸月星, 赵建新. 白云岩储层成因的激光原位U-Pb定年和同位素地球化学新证据——以四川盆地西北部中二叠统栖霞组白云岩储层为例[J]. 石油学报, 2022, 43(2): 223-233.

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New evidence of laser in-situ U-Pb dating and isotopic geochemistry for the genesis of dolomite reservoir: a case study of dolomite reservoir from Middle Permian Q ixia Formation in northwestern Sichuan Basin

白云岩储层成因的激光原位U-Pb定年和同位素地球化学新证据——以四川盆地西北部中二叠统栖霞组白云岩储层为例

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