摘要
为深入研究吴起地区延长组长6段储层地质特征,通过开展各类分析测试,对研究区储层孔隙结构特征和流体可动性进行了定量表征,系统分析了不同成岩作用强度与物性之间的关系。结果表明:研究区长6段储层岩石类型为长石砂岩,填隙物以铁方解石和绿泥石为主,储层物性较差,孔隙类型以残余粒间孔为主。储层孔隙结构可分为Ⅰ类、Ⅱ类和Ⅲ类,对应的孔喉大小、孔喉连通性和可动流体饱和度依次变差。研究区长6段储层压实作用中等偏强,压实作用主要是减小储层的孔隙空间,但对储层渗流能力影响较小;碳酸盐矿物和黏土矿物胶结均降低了储层物性,但绿泥石膜的存在可以有效保存储集空间;而溶蚀作用对储层物性的改善作用较小。以上成果对鄂尔多斯盆地吴起地区延长组储层综合评价和开发方案制定具有一定理论指导价值。
To deeply study the geological characteristics of the reservoir in Chang6 Member of Yanchang Formation in Wuqi Area,the pore structure characteristics and fluid mobility of the reservoir in the study area were quantitatively characterized through various analysis tests and the relationship between different diagenesis intensities and physical properties was systematically analyzed.The results show that the reservoir rock type of Chang 6 Member in the study area is feldspar sandstone,and most interstitial materials are ferruginous calcite and chlorite;the reservoir physical properties are poor,and the pore type is mainly residual intergranular pore.The pore structure of the reservoir can be divided into classⅠ,classⅡand classⅢ,and the corresponding pore-throat size,pore-throat connectivity,and movable fluid saturation become worse in turn.The compaction of Chang6 Member reservoir in the study area is moderately strong,which mainly reduces the pore space of the reservoir but has little effect on its seepage capacity.The cementation of carbonate minerals and clay minerals reduces the reservoir’s physical properties,but chlorite film can effectively preserve the reservoir space.However,dissolution has little effect on the improvement of reservoir physical properties.The above achievements have a certain theoretical guiding value for the comprehensive evaluation and development plan formulation of Yanchang Formation reservoir in Wuqi Area of Ordos Basin.
作者
白江
BAI Jiang(Exploration and Development Institute,Wuqi Oil Production Plant,Shaanxi Yanchang Oilfield Co.,Ltd.,Shaanxi Yan’an 717600,China)
出处
《非常规油气》
2024年第2期46-55,共10页
Unconventional Oil & Gas
基金
陕西省科技统筹创新项目“延长难采储量有效动用开发技术研究”(2016KTCL01-12)。
关键词
吴起地区
储层特征
孔隙结构
成岩作用
Wuqi Area
reservoir characteristics
pore structure
diagenesis
