特种油气藏2024，Vol.31Issue(6)：57-66,10.DOI:10.3969/j.issn.1006-6535.2024.06.007
川中地区沙二一段古地貌对河道砂体发育的控制作用
Paleogeomorphology Control of J2s12 in the Central Sichuan Basin on the Development of Channel Sand Bodies
摘要
Abstract
The Shaximiao Formation is currently a key target for exploration and development of continental tight oil and gas in the Sichuan Basin,and the main gas-bearing series is the channel sand bodies of J2s12.However,the re-search on the coupling relationship between the channel sand bodies and palaeogeomorphology is scarce,which re-stricts further fine exploration and development of tight gas.To address this issue,based on the establishment of an isochronous framework in the central Sichuan Area and employing the principle of sedimentary compensation,the paleogeomorphology of the J2s12 was semi-quantitatively restored using the impression method while fully considering the differential compaction of strata.An integrated analysis of core,well logging,and seismic data was conducted on the J2s12 section of the sedimentary system,which then serves as the basis for analyzing the coupling relationships be-tween various ancient landform units and sedimentary microfacies.The seismic multi-attribute integration method was utilized to predict the thickness of the sand bodies,proposing that palaeogeomorphology controls the distribution of channel sand bodies and the preferential pathways for sediment transport,namely"the valley transporting sand,interfluvial hill separating sand,and gentle slope stopping the sand".Research results indicate that J2s12 in the cen-tral Sichuan Area features ancient landform pattern of alternating valleys and hills,with higher elevations in the westsouth and lower elevations in the eastnorth,and an overall gentle slope.The area primarily consists of major river valleys,tributary valleys,interfluves,and gentle slopes.The main morphological units developed include primary valleys,tributary valleys,interfluvial hills,and gentle slopes.The J2s12 section in the study area features a continental river sedimentary system,with channel sand bodies distributed in a banded pattern.The ancient landform units of the J2s12 section control the distribution of sedimentary microfacies,with channel deposits concentrated in the valleys and floodplain deposits more frequently occurring on the gentle slopes.This research provides valuable insights for the subsequent exploration of tight gas.关键词
古地貌/河道砂体/印模法/沉积体系/控砂机制/沙溪庙组/四川盆地Key words
palaeogeomorphology/channel sand body/impression method/sedimentary system/sand control mecha-nism/Shaximiao Formation/Sichuan Basin分类
能源科技引用本文复制引用
吴鑫涛,刘丽,葛家旺,冯潇飞,胡成军,肖尧,宋林珂..川中地区沙二一段古地貌对河道砂体发育的控制作用[J].特种油气藏,2024,31(6):57-66,10.基金项目
国家自然科学基金"多幕裂陷盆地断裂生长演化及砂体分配响应机制——以南海珠江口盆地陆丰凹陷为例"(41902124) （41902124）
