特种油气藏2017，Vol.24Issue(1)：43-48,6.DOI:10.3969/j.issn.1006-6535.2017.01.009
致密砂岩气藏泥岩过剩压力与天然气富集
Mudstone Excess Pressure and Natural Gas Enrichment in Tight Sandstone Gas Reservoir
摘要
Abstract
Mudstone excess pressure is calculated by equivalent-depth method to identify the relationship between mudstone excess pressure and natural gas enrichment.The relationship between mudstone excess pressure and spatial distribution of gas-bearing reservoirs is analyzed in the Upper Paleozoic tight sandstone gas reservoir of Ordos Basin.Research shows that the Upper Paleozoic mudstone strata in Ordos Basin are mainly featured by undercompaction and there are 3 categories of single-well excess pressure curves, namely single-peak, multi-peak and non-peak categories.Shiqianfeng-Shanxi Formation is identified as a complete compartment system with abnormal pressure.The maximum mudstone excess pressure often appears in Shiqianfeng-Upper Shihezi Formation, which blocks the upward migration of hydrocarbon.Gas-bearing reservoirs mainly develop in the lower Shihezi-Shanxi Formation.Natural gas enrichment is dependent on the stability and continuity of pressure compartment.Comparing with the pressure compartments in the southern part of basin, the pressure compartments in the northern and central parts are characterized by stable distribution, better continuity, favorable gas production test and relatively high gas enrichment.This strong correlation between mudstone excess pressure and natural gas enrichment in tight sandstone gas reservoir can be used to explore favorable zones, which could provide certain geological reference for next further exploration.关键词
过剩压力/压力封存箱/天然气富集/上古生界/致密砂岩油藏/鄂尔多斯盆地Key words
excess pressure/pressure compartment/natural gas enrichment/Upper Paleozoic/tight sandstone reservoir/Ordos Basin分类
能源科技引用本文复制引用
赵谦平,刘鹏,银晓..致密砂岩气藏泥岩过剩压力与天然气富集[J].特种油气藏,2017,24(1):43-48,6.基金项目
国家自然科学基金重大项目"非常规油气开发地球物理理论与方法研究"课题一"中国非常规油气储层特征、分类与典型地质模型建立"(41390451) （41390451）
国家自然科学基金面上项目"华北南缘与西缘早古生代等深流沉积特征类比及地质意义"(41172102) （41172102）
