M 地区致密砂岩储层预测方法研究

M 地区在晚三叠世须二段沉积时期发育辫状河三角洲前缘亚相，沉积有大套较厚的砂岩，同时夹有 薄层泥岩，为典型的砂包泥沉积，储层为孔隙度与渗透率均很低的致密砂岩孔隙型储层。有效剔除泥岩夹 层与致密非储层砂岩是M 地区储层预测的重点。提出利用自然伽马反演剔除薄层泥岩的影响，再结合孔 隙度曲线进行拟声波波阻抗反演，凸显孔隙型储层响应，从而进行综合储层预测。研究结果表明，M 地区 西北部为主河道发育区，储层相对发育。

Prediction method for tight sand reservoir in M region

Braided delta front facies is the major depositional system developed in Late Triassic Xujiahe Formation in M region, where deposited a large set of sandstone with mudstone thin layer. The reservoir is typical sand bag mud sedimentation and tight sandstone reservoir with very low porosity and permeability, and porous sandstone is the main reservoir type. Therefore, how to effectively distinguish the thin mudstone layer and none-reservoir dense sandstone is very important for reservoir prediction in M region. This paper used gamma inversion and porosity curve fitting acoustic inversion to reflect the porous reservoir response and conduct comprehensive reservoir prediction. The result shows that the northwest of M region is the main stream channel development area, where reservoir is relatively developed.