海相油气地质2023，Vol.28Issue(4)：401-412,12.DOI:10.3969/j.issn.1672-9854.2023.04.007
川中古隆起北斜坡蓬莱气区上震旦统—下寒武统海相碳酸盐岩天然气多层系立体成藏
Multi-layers three-dimensional natural gas accumulation of the Upper Sinian-Lower Cambrian marine carbonate rocks in Penglai gas area,north slope of central Sichuan paleo-uplift
摘要
Abstract
In September 2022,the Well Dongba-1,deployed by PetroChina Southwest Oil&Gas Field Company on the north slope of the central Sichuan paleo-uplift(Penglai gas area),achieved a significant exploration breakthrough in the Longwangmiao Formation of Lower Cambrian.The breakthrough conform the multi-layers three-dimensional natural gas accumulation in ultra deep and ancient marine carbonate rocks of Upper Sinian-Lower Cambrian in the north slope of central Sichuan paleo-uplift.First,this article analyzes the sedimentary facies,lithofacies,and reservoirs of multiple gas-bearing layers of Upper Sinian-Lower Cambrian in Penglai gas area.Then,starting from three aspects:source rock and source reservoir configuration,sedimentary facies and diagenesis,multi-layers gas bearing characteristics and traps,the favorable conditions for multi-layers gas bearing in the slope area are dissected,and a three-dimensional reservoir formation model is established.The results indicate the widely distributed thick and high-quality source rock such as the mud shale of the Dengying Member 3 and the black shale of Qiongzhusi Formation,provides a good material guarantee for multi-layers natural gas accumulation.The source-reservoir assemblages of upper generation-lower storage and side generation-side storage ensures the efficient filling of natural gas into the reservoir.The Sinian Dengying Formation is influenced by multiple cycles of Tongwan movement and sea level's rising and falling,and thick stacked mound-shoals are developed.The Cambrian Canglangpu Formation and Longwangmiao Formation are controlled by paleogeomorphology to develop high-energy granular shoals of dolomitization.The mound-shoals and high-energy granular shoals form the material basis for reservoir formation,and the widely developed karst process in the later stage further improves the physical conditions of the reservoir,directly controlling the formation and distribution of high-quality reservoirs.Locally developed small-scale structural traps,together with lithological traps and structural-lithological composite traps in the slope background,control the multi-layers gas bearing.Exploration practice has shown that the Sichuan Basin is rich in ultra-deep oil and gas resources.Continuously deepening the understanding of ultra-deep reservoir formation and geological theory,emphasizing the simultaneous advancement and mutual promotion of geological theory and engineering technology,and continuing to advance towards the 10 000 meter's ultra-deep layer will inevitably open up new fields of high-quality scale reserve and production.关键词
超深层/立体成藏/龙王庙组/沧浪铺组/灯影组/北斜坡/川中古隆起Key words
ultra-deep layer/three-dimensional natural gas accumulation/Longwangmiao Formation/Canglangpu For-mation/Dengying Formation/north slope/central Sichuan paleo-uplift分类
能源科技引用本文复制引用
张本健,马奎,杨岱林,李勇,张自力,陈曦,孙奕婷,向柱,黄茂轩,周刚,宋泽章,严威,汪华,陶佳丽,田兴旺,丁孝恒,钟原..川中古隆起北斜坡蓬莱气区上震旦统—下寒武统海相碳酸盐岩天然气多层系立体成藏[J].海相油气地质,2023,28(4):401-412,12.基金项目
本文受国家自然科学基金面上项目"深层、超深层热液活动及其对古油藏改造效应定量表征"(编号:42272161),中国石油西南油气田公司项目"蓬莱气区灯影组储层特征及成因机理研究"(编号:20220301-01-01),中国石油天然气股份有限公司重大科技专项"四川盆地风险勘探领域和目标研究、工程技术攻关及现场试验"(编号:2022KT0503),四川科力特油气技术服务有限公司项目"超深层微生物白云岩储层孔隙结构多尺度定量表征"(编号:SCKLT-JSZS-2022-0044)联合资助 （编号:42272161）
