物探与化探2025，Vol.49Issue(2)：288-298,11.DOI:10.11720/wtyht.2025.1356
川东南地区凉高山组致密砂岩岩石物理建模
Petrophysical modeling of tight sandstones of the Lianggaoshan Formation,Southeast Sichuan
摘要
Abstract
The exploration and exploitation practices in the Sichuan Basin in recent years indicate that breakthroughs have been a-chieved in the Jurassic continental tight sandstones.Nevertheless,due to the low porosity and permeability of tight sandstone,conven-tional post-stack inversion frequently exhibits limited resolution,failing to meet the accuracy requirements for the prediction of actual ex-ploration reservoirs.This necessitates pre-stack inversion for detailed characterization of tight sandstones,while S-wave velocity is crucial to pre-stack inversion.Based on continental exploration wells drilled in the southeastern Sichuan Basin in recent years,this study devel-oped a petrophysical modeling technique for dense sandstones in this region.Specifically,given the low permeability of tight sandstones and the uneven mixing of fluids in the pore space,the Domenico model was preferentially employed to calculate the pore fluid modulus.Although fluid modulus and density are inevitably variable under the actual subsurface conditions,previous studies typically use constant values to conduct petrophysical modeling for tight sandstones.In this study,depth-dependent values were applied.Tight sandstones in the southeastern Sichuan Basin generally exhibit a porosity of less than 10%.Therefore,calculations using the Nur and the Krief models will yield high errors.Given this,this study preferred using the Lee-Pride model to calculate the skeleton modulus and controlled the re-lationship between the rock matrix and the skeleton by introducing the value of the cementation parameter.The application of the estab-lished petrophysical model of tight sandstone to an actual survey area indicates high agreement with data from actual wells.Additionally,based on log statistics,Poisson's ratio,the most sensitive parameter is used for high-precision pre-stack inversion in the proposed tech-nique,enabling detailed characterization and prediction of the internal structure of channel sandstones.关键词
致密砂岩/岩石物理建模/孔隙流体模量/横波预测/叠前反演Key words
tight sandstone/petrophysical modeling/pore fluid modulus/S-wave prediction/pre-stack inversion分类
天文与地球科学引用本文复制引用
张郑玉成,苏建龙..川东南地区凉高山组致密砂岩岩石物理建模[J].物探与化探,2025,49(2):288-298,11.基金项目
中国石化股份项目"四川盆地及周缘资源评价"(P23221) （P23221）
