华南地质2025，Vol.41Issue(2)：436-450,15.DOI:10.3969/j.issn.2097-0013.2025.02.016
宜昌及周边地区寒武系石龙洞组储层特征及勘探方向
Characteristics and Exploration Direction of the Cambrian Shilongdong Formation Reservoir in Yichang and Surrounding Areas
摘要
Abstract
The exploration and discovery of Cambrian shale gas in the Yichang area indicates enormous potential for oil and gas resources.The Cambrian Shilongdong Formation,overlaid with the Qinjiamiao Formation gypsum rock cap,has become an important layer for conventional oil and gas exploration.This study has researched the reservoir and controlling factors of the Shilongdong Formation through observations and descriptions of drilling cores from Yichang and its surrounding areas,combined with the information on rock thin sections,physical properties,carbon and oxygen isotopes.The results indicate that the Shilongdong Formation reservoir in Yichang and surrounding areas was mainly formed in a confined platform environment.The reservoir lithology is dominantly fine crystalline dolomite and granular dolomite,with an average porosity of 5.2％and an average permeability of 8.638×10-3 μm2.The pore type is mainly dissolution pores.The Shilongdong Formation was formed in a warm or hot subtropical environment,and the main factors controlling reservoir development include sedimentary facies,dolomitization,dissolution,and structural fractures.The ancient uplift at the turn of the Cambrian and Cambrian periods controlled the distribution of high-quality reservoirs in the Shilongdong Formation and also served as a directional zone for oil and gas migration.The hydrocarbon generation time of the ancient uplift edge source rocks is late,the oil and gas diffusion time is short,and the preservation conditions are relatively favorable.Therefore,the favorable area for natural gas exploration of the Shilongdong Formation in the Yichang area is located in the southeast edge of the Huangling Uplift-Dangyang Syncline,due to factors such as the reservoir of the Shilongdong Formation,the cap rock of the Qinjiamiao Formation,traps,and structural preservation conditions.关键词
宜昌地区/寒武系/石龙洞组/储层特征/控制因素/天然气勘探方向Key words
Yichang area/Cambrian/Shilongdong Formation/reservoir characteristics/control factors/natural gas exploration directions分类
天文与地球科学引用本文复制引用
刘安,程青松,姚明君,李旭兵,刘皓天,李海,危凯..宜昌及周边地区寒武系石龙洞组储层特征及勘探方向[J].华南地质,2025,41(2):436-450,15.基金项目
中国地质调局项目(DD20179615、DD20240047)和中国石油浙江油田公司科研项目(2023YQXNCS001-10) （DD20179615、DD20240047）
