特种油气藏2024，Vol.31Issue(3)：18-26,9.DOI:10.3969/j.issn.1006-6535.2024.03.003
四川盆地天府地区上三叠统须家河组四段致密储层砂体刻画及有利储层预测
Characterization of Tight Sandstone Reservoirs and Prediction of Favorable Reservoirs in the Fourth Member of the Upper Triassic Xujiahe Formation in the Tianfu Area of the Sichuan Basin
摘要
Abstract
The fourth member of the Upper Triassic Xujiahe Formation in the Tianfu Area of the Sichuan Basin(re-ferred to as the T3x4)is characterized by thick sandstone layers interbedded with thin mudstone layers,making it a crucial exploration target for tight sandstone gas reservoirs.However,due to limitations in seismic vertical resolution,thin mudstone layers are hard to be determined by conventional methods,hindering the precise characterization of sandstone in this interval.This limitation has impeded the understanding of the distribution patterns of sand bodies in the basin and identification of favorable target areas.To address these issues,this study integrates drilling data with seismic facies and establishes a mapping relationship between the two.Under the constraint of natural gamma-ray curves,optimal inversion frequency parameters were sought to enhance the accuracy of inter-well sand body pre-diction.The distribution characteristics of the T3x4 sandstone in the Upper Triassic Xujiahe Formation were well characterized with waveform indication simulation method.The results indicate that the T3x4 sandstone exhibits characteristics of being thick in the west(55.0 to 100.0 m)and thin in the east(15.0 to 50.0 m).Compared to the third member of the Xujiahe Formation,the transition zone of sand body thickness variation(slope break zone)has migrated towards the interior of the craton.Analyzing data from 18 wells within the seismic working area,it was observed that beneath the slope break zone,the sandstone has a high average porosity(8.0%)and a large reservoir thickness(45.4 m).Considering tectonic evolution,sedimentary facies distribution,sandstone thickness,and po-rosity variations,it is proposed that the T3x4 follows a pattern of structures control slope break zones,and slope break zones control reservoirs.Regions below the slope break zones exhibit favorable reservoir properties with good physi-cal characteristics and significant thickness,making them promising exploration areas.The study results provide val-uable insights for the in-depth exploration of the T3x4.关键词
致密砂岩/砂体刻画/波形指示模拟/井震结合/储层预测/须家河组/四川盆地Key words
thick Sandstone/Sandstone characterization/waveform indication simulation/well-seismic integration/reservoir prediction/Xujiahe Formation/Sichuan Basin分类
能源科技引用本文复制引用
邱玉超,许强,李一博,邓伟,郑超,赵正望,金值民,谭秀成..四川盆地天府地区上三叠统须家河组四段致密储层砂体刻画及有利储层预测[J].特种油气藏,2024,31(3):18-26,9.基金项目
国家自然科学基金"林周盆地晚白垩世从海到山对冈底斯俯冲-碰撞隆升过程的制约"(42272257) （42272257）
中国石油西南油气田分公司科技项目"四川盆地须家河组致密储层特征和成藏规律研究"(20230301-09) （20230301-09）
