库车低孔裂缝性砂岩储集层裂缝发育特征分析

Feature of fractures for low porosity fractured sandstone reservoirs in Kuqa

针对库车低孔裂缝性砂岩储集层地区在油气勘探过程中出现的裂缝发育特征、分布规律难以解释的问题.通过新井裂缝参数描述和建立裂缝宏观分布模型.野外大岩样与剖面（岩心）裂缝参数对比等途径,建立了单井测试段裂缝展布模型;进而系统地分析了裂缝发育特征.认为裂缝分布主要受构造位置与断层的影响,即构造高部位如断背斜核部或邻近断层部位裂缝发育.从而为各井测试层段的选取提供了地质依据。研究结果为后期产能定性半定量分析及产能预测提供了重要的数据支掸.并对裴似低孔裂缝性砂岩储集层的裂缝分析具有借鉴意义。

For the problem of difficultly explaining fracture developed characteristics and distribution law which appeared in low porosity fractured sandstone reservoir area during oil and gas exploration in Kuqa,by initial fracture parameter description and establishment of fracture macroscopic distribution model,correlation between field large rock sample and profile(core) fracture parameter and other ways,the fracture through-going model was established for the test zones of single wells,and then the fracture developed characteristics was systematically analyzed,the authors considered that the fracture distribution was mainly affected by tectonic setting and faults,that is structural high position,such as the core of faulted anticline or adjacent fault location,developed the fractures,thus providing geological basis for determining test zones of each well.The results provided important data support for late productivity qualitative and semi-quantitative analysis and productivity prediction,and had reference for fracture analysis of the similar low porosity fractured sandstone reservoirs.