摘要
通过岩心观察、铸体薄片、扫描电镜、黏土矿物X衍射及物性分析等多种分析测试手段,对定边油田长2特低渗砂岩储层成岩作用及物性演化历史进行了研究。结果表明:长2砂岩储层经历了机械压实、胶结和溶蚀等多种成岩作用,其中压实作用是减少储层孔隙的主要因素,胶结作用进一步强化了储层孔隙损失率,而溶蚀作用在一定程度上改善了储层物性。长2砂岩储层主要处于中成岩阶段A期,储层孔隙演化与成岩作用过程和历史密切相关,经计算压实损失的孔隙度为22.18%,胶结损失孔隙度为5.26%,溶蚀增加孔隙度为3.18%,最终计算长2砂岩储层孔隙度定格为16.14%,与实测平均孔隙度值16.04%较一致,成岩作用的剖析与孔隙定量演化为评价和筛选有利储层提供了地质依据和技术支持。
The evolution history of diagenesis and physical property of Chang 2 ultra-low permeability sandstone reservoir in Dingbian Oilfield was studied by core observation, casting thin section, scanning electron microscopy, X-ray diffraction of clay minerals and physical property analysis. The results show that Chang 2 sandstone reservoir has undergone mechanical compaction, cementation and dissolution, among which compaction is the main factor to reduce reservoir porosity, cementation further strengthens reservoir porosity loss rate,and dissolution improves the physical properties of the reservoir to a certain extent. Chang 2 sandstone reservoir is mainly in stage A of middle diagenesis. Pore evolution of reservoir is closely related to diagenesis process and history. The porosity loss ratio of compaction is22.18%, the porosity loss ratio of cementation is 5.26%, and the porosity increase ratio of dissolution is 3.18%. Finally, the calculated porosity of Chang 2 sandstone reservoir is 16.14%, which is consistent with the measured average porosity of 16.04%. Diagenesis analysis and quantitative pore evolution provide geological basis and technical support for evaluating and screening favorable reservoirs.
出处
《石油工业技术监督》
2019年第2期7-11,共5页
Technology Supervision in Petroleum Industry
基金
国家自然科学基金项目"力学与化学耦合下泥页岩井壁蠕变损伤失稳研究"(编号:51174162)和"基于构型力学理论的井壁损伤失稳研究"(编号:51674200)
关键词
成岩作用
孔隙演化
特低渗砂岩
长2储层
定边油田
diagenesis
pore evolution
extra-low permeability sandstone
Chang 2 reservoir
Dingbian oilfield
