Dolomitization and its relationship with reservoir development of the Lower Triassic Feixianguan Formation in eastern Sichuan Basin

doi:10.7605/gdlxb.2012.02.004

JOURNAL OF PALAEOGEOGRAPHY ›› 2012, Vol. 14 ›› Issue (2): 176-186. doi: 10.7605/gdlxb.2012.02.004

• SPECIAL ISSUE ABOUT “Origin of Dolostone and Oil and Gas Reservoir” • Previous Articles Next Articles

Dolomitization and its relationship with reservoir development of the Lower Triassic Feixianguan Formation in eastern Sichuan Basin

Pan Liyin^1,2, Liu Zhanguo¹, Li Chang¹, Shou Jianfeng^1,2, Zhang Jianyong^1,2, Zhang Jie^1,2, Shen Anjiang^1,2, Zhou Jingao^1,2, Zheng Xingping^1,2

1 PetroChina Hangzhou Research Institute of Geology，Hangzhou 310023，Zhejiang
2 Key Laboratory of Carbonate Reservoir，CNPC， Hangzhou 310023，Zhejiang

Received:2011-09-10 Revised:2012-01-05 Online:2012-04-01 Published:2012-04-01
About author:Pan Liyin，born in 1981，received his M.S.degree from Nanjing University in 2006.Now he is an engineer of PetroChina Hangzhou Research Institute of Geology and is mainly engaged in carbonate petrography and geochemistry.图1 四川盆地东部长兴组—飞仙关组沉积相及气田位置（据张建勇等，2011，有修改）
Fig.1 Sedimentary facies of the Changxing-Feixianguan Formations and location
of gas fields in eastern Sichuan Basin(Modified from Zhang et al.，2011)

四川盆地东部下三叠统飞仙关组白云岩化作用及其与储集层发育的关系^*

潘立银^1,2 刘占国¹ 李昌¹ 寿建峰^1,2 张建勇^1,2 张杰^1,2 沈安江^1,2 周进高^1,2 郑兴平^1,2

1 中国石油杭州地质研究院，浙江杭州 310023
2 中国石油天然气集团公司碳酸盐岩储层重点实验室，浙江杭州 310023

作者简介:潘立银，男，1981年生，2006年毕业于南京大学，获硕士学位。现为中国石油杭州地质研究院工程师，从事碳酸盐岩岩石学和地球化学研究工作。E-mail: panly_hz@petroChina.com.cn。
基金资助:
国家科技重大专项（编号：2011ZX05004-002）资助

Abstract

Abstract: Gas reservoirs of the Lower Triassic Feixianguan Formation in eastern Sichuan Basin are mostly dolostones，which are distributed in the platform margin around Kaijiang-Liangping Basin. Petrographic and geochemical evidences indicate multiple dolomitization events，and the most significant one of which was triggered penecontemporaneously by reflux of evaporative seawater. Dolostones formed in early periods had undergone various degree of recrystallization during burial，which resulted in the complex rock textures. Pore of the Feixianguan Formation dolostones is predominantly intergranular and/or oomoldic(or intragranular)，which is inherited from the precursor limestones rather than creating during dolomitization.These kinds of pore are well preserved in dolostones，owing to early dolomitization and the resistance of dolomites to compaction.

Key words: Sichuan Basin, Feixianguan Formation, oolitic shoal reservoir, dolomitization

摘要： 四川盆地东部下三叠统飞仙关组鲕滩相储集层多为白云岩，主要分布于环开江—梁平盆地的台地边缘相带。岩石学和地球化学特征表明，飞仙关组鲕滩相储集层经历了多期白云岩化作用，其中最重要的一期发生于成岩早期近地表环境，由蒸发海水回流引起，形成的粉晶交代白云石构成了现今白云岩的主体。飞仙关组早期白云岩经历了不同程度的埋藏重结晶作用，形成了不同的岩石结构类型。飞仙关组白云岩的孔隙多为原岩中继承而来，白云岩化作用对储集层发育的意义并非创造孔隙，而是保存已有的孔隙。由于白云岩化作用发生的时间早以及白云岩的抗压溶性质，原生（鲕）粒间孔以及早期大气淡水溶蚀作用形成的鲕模孔/粒内溶孔可以在很大程度上保存下来，构成了现今鲕滩相储集层的主要储集空间。

关键词: 四川盆地, 飞仙关组, 鲕滩相储集层, 白云岩化作用

CLC Number:

P618.230.2+1

Pan Liyin, Liu Zhanguo, Li Chang, Shou Jianfeng, Zhang Jianyong, Zhang Jie, Shen Anjiang, Zhou Jingao, Zheng Xingping. Dolomitization and its relationship with reservoir development of the Lower Triassic Feixianguan Formation in eastern Sichuan Basin[J]. JOURNAL OF PALAEOGEOGRAPHY, 2012, 14(2): 176-186.

潘立银, 刘占国, 李昌, 寿建峰, 张建勇, 张杰, 沈安江, 周进高, 郑兴平. 四川盆地东部下三叠统飞仙关组白云岩化作用及其与储集层发育的关系^*[J]. 古地理学报, 2012, 14(2): 176-186.

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Dolomitization and its relationship with reservoir development of the Lower Triassic Feixianguan Formation in eastern Sichuan Basin

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四川盆地东部下三叠统飞仙关组白云岩化作用及其与储集层发育的关系^*