盐湖盆地复杂岩性区储层预测方法研究--以江汉盆地潜江凹陷为例

摘要

Sandstone reservoirs were predicted so as to propose a new method for the studies of reservoirs with complicated lithology in saline lake basins. The study area was the semi⁃saline period in the oil group no.0 in the fourth member of the Paleogene Qianjiang Formation ( E2 q04 ) in areas W, G, and H in the Qianjiang Sag of Jianghan Basin. The method was called “four⁃definition”, which defines sedimentary facies through integrating geologic data with seismic data, defines markers through petrophysical modeling, defines geological boundaries through comprehensive multi⁃attribute geological analysis, and defines stratigraphic thicknesses through definitive inversion. Applications in the Qianjiang Sag succeeded in finding several high⁃yielding oil pools of beach bar facies, showing that the method can improve the prediction accuracy in reservoirs with complicated lithology.%通过对江汉盆地潜江凹陷王—广—浩地区古近系潜江组潜4段0油组半咸化期砂岩储层的预测，形成了一套剖析盐湖盆地复杂岩性区储层的预测方法———“四定法”储层预测技术，即：地质地震复合相定相带、岩石物理建模定标志、多属性地质综合分析定边界、确定性反演定厚度。近3年来，采用“四定法”在潜江凹陷进行边研究、边实践、边总结，发现了多个高产滩坝岩性油藏，取得了较好的勘探效果。该方法的推广应用，可有效提高复杂岩性区储层预测的准确性。