川中地区蓬莱气田震旦系灯影组二段储层发育主控因素及分布规律

doi:10.12108/yxyqc.20240305

岩性油气藏 ›› 2024, Vol. 36 ›› Issue (3): 50–60.doi: 10.12108/yxyqc.20240305

川中地区蓬莱气田震旦系灯影组二段储层发育主控因素及分布规律

夏茂龙¹, 张本健¹, 曾乙洋¹, 贾松¹, 赵春妮¹, 冯明友², 李勇¹, 尚俊鑫²

1. 中国石油西南油气田公司勘探开发研究院, 成都 610041;
2. 西南石油大学地球科学与技术学院, 成都 610500

收稿日期:2023-04-23 修回日期:2023-05-14 出版日期:2024-05-01 发布日期:2024-04-30
第一作者:夏茂龙（1982—），男，硕士，高级工程师，主要从事油气地质方面的研究工作。地址:（610041）四川省成都市高新区天府大道北段 12 号。Email:xiamaolong@petrochina.com.cn。
通信作者: 冯明友（1981—），男，博士，副教授，主要从事储层地质方面的教学与研究工作。Email:fmyswpu@163.com。
基金资助:
西南油气田公司科技项目“蓬莱气区灯影组气藏特征研究”（编号：XNS 勘验院 JS2022-034）与中国石油天然气股份有限公司科学研究与技术开发项目“西南油气田天然气上产 300 亿立方米关键技术研究与应用”（编号：2016E-06）联合资助。

Main controlling factors and distribution of reservoirs of the second member of Sinian Dengying Formation in Penglai gas field，central Sichuan Basin

XIA Maolong¹, ZHANG Benjian¹, ZENG Yiyang¹, JIA Song¹, ZHAO Chunni¹, FENG Mingyou², LI Yong¹, SHANG Junxin²

1. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China;
2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China

Received:2023-04-23 Revised:2023-05-14 Online:2024-05-01 Published:2024-04-30

摘要/Abstract

摘要： 结合岩心、薄片及分析测试等资料，对川中蓬莱气田震旦系灯影组二段储层的主控因素及分布规律进行了详细研究。研究结果表明：①蓬莱气田震旦系灯二段储层主要由凝块石白云岩、泡沫绵层白云岩及砂屑白云岩组成，储集空间包括孔隙、溶洞及裂缝，以残余格架孔和中小型溶洞为主，孔隙多发育于微生物黏结白云岩及颗粒白云岩中。灯二上亚段储层孔隙度为 2.0%~11.0%，平均为 4.43%，渗透率为 0.005~10.000 mD，平均为 1.190 mD；灯二下亚段储层孔隙度为 2.00%~6.98%，平均为 3.64%，渗透率为 0.030 9~2.600 0 mD，平均为 0.950 0 mD。②微生物丘滩体展布及准同生期岩溶作用、表生期岩溶作用共同控制了研究区灯二段储层的分布及品质，优质储层多发育于灯二上亚段中上部和灯二下亚段顶部。③研究区灯二下亚段总体属海进半旋回产物，仅上部发育孔洞/缝洞型储层，中部及下部储层欠发育。灯二上亚段多为海退半旋回产物，其 1 小层为次级海侵背景，丘滩体厚度薄，以孔隙型储层为主；2 小层在海退背景下发育连片分布的丘滩体，储层厚，以孔洞型储层为主（多为Ⅱ类储层），为区内主力产气层段；3 小层总体为海退晚期浅水台坪沉积，葡萄花边构造发育，岩溶改造作用较明显，储层多为缝洞叠加岩溶型储层（Ⅲ类储层）。

关键词: 微生物黏结白云岩, 颗粒白云岩, 微生物丘滩, 准同生期岩溶, 表生期岩溶, 海进, 海退, 灯影组二段, 震旦系, 蓬莱气田, 川中地区

Abstract: Based on data of rock cores, thin sections and analysis tests, a detailed study was conducted on the main controlling factors and distribution of the second member of Sinian Dengying Formation in Penglai gas field in central Sichuan Basin. The results show that:（1）The reservoirs of the second member of Sinian Dengying Formation in Penglai gas field are mainly composed of thrombolite dolomite, foam spongy dolomite and doloarenite. The reservoir space includes pores, caves and fractures, dominated by residual framework pores and small and medium-sized caves. The pores are mostly developed in microbial bonded dolomite and grain dolomite. The porosity of the reservoir in the upper Deng 2 member is 2.0%-11.0%, with an average of 4.43%, and the permeability is 0.005-10.000 mD, with an average of 1.19 mD. The porosity of the reservoir in the lower Deng 2 member is 2.00%-6.98%, with an average of 3.64%, and the permeability is 0.030 9-2.600 0 mD, with an average of 0.950 0 mD（. 2）The distribution and quality of reservoirs of Deng 2 member in the study area are jointly controlled by the distribution of microbial mound shoal, quasi syngenetic karstification and supergene karstification. High-quality reservoirs are mostly developed in the upper and middle parts of the upper Deng 2 member and the top of the lower Deng 2 member.（3）The lower Deng 2 member in the study area is generally a product of semi cyclical marine transgression, with vuggy-fractured reservoirs only developed in the upper part and reservoir undeveloped in the middle and lower parts. The upper Deng 2 member is mostly a product of regression and semi cycle. No. 1 sublayer developed in a secondary transgression background, with thin mound shoal, dominated by porous reservoir. No. 2 sublayer developed contiguous mound shoal under regression, with thick reservoirs mainly composed of vuggy reservoirs（mostly type Ⅱ reservoirs）, which is the main gas producing zone in the study area. The No. 3 sublayer is overall shallow water platform deposit in the late stage of regression, with well-developed botryoidal-lace shape structures and obvious karst transformation, dominated by karst reservoirs with superimposed fractures and caves（type Ⅲ reservoirs）.

Key words: microbial bonded dolomite, grain dolomite, microbial mound shoal, quasi syngenetic karstification, supergene karstification, transgression, regression, the second member of Dengying Formation, Sinian, Penglai gas field, central Sichuan Basin

中图分类号:

TE122.2

夏茂龙, 张本健, 曾乙洋, 贾松, 赵春妮, 冯明友, 李勇, 尚俊鑫. 川中地区蓬莱气田震旦系灯影组二段储层发育主控因素及分布规律[J]. 岩性油气藏, 2024, 36(3): 50–60.

XIA Maolong, ZHANG Benjian, ZENG Yiyang, JIA Song, ZHAO Chunni, FENG Mingyou, LI Yong, SHANG Junxin. Main controlling factors and distribution of reservoirs of the second member of Sinian Dengying Formation in Penglai gas field，central Sichuan Basin[J]. Lithologic Reservoirs, 2024, 36(3): 50–60.

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川中地区蓬莱气田震旦系灯影组二段储层发育主控因素及分布规律

Main controlling factors and distribution of reservoirs of the second member of Sinian Dengying Formation in Penglai gas field，central Sichuan Basin

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