板桥长6段低渗-超低渗储层储集空间定量分析  

Quantitative Analysis of Chang 6 Low Permeability and Ultra- Low Permeability Reservoir Space in Banqiao- Heshui Area,Ordos Basin

作　　者：高旭[1,2] 孙卫[1,2] 曹雷[1,2] 霍磊[1] 盛军[1,2] 刘毅[3] 

机构地区：[1]西北大学大陆动力学国家重点实验室 [2]西北大学地质学系,陕西西安710069 [3]中国石油长庆油田分公司第一采油厂吴堡采油作业区,陕西延安716000

出　　处：《延安大学学报（自然科学版）》2015年第4期63-67,共5页Journal of Yan'an University：Natural Science Edition

基　　金：国家科技重大专项大型油气田及煤层气开发项目(2011ZX05044)

摘　　要：通过铸体薄片、扫描电镜、X线衍射、岩石图像粒度分析及相关物性等资料,采用定性分析与定量计算相结合的方法,对板桥—合水地区长6段低渗-超低渗储层储集空间进行了定量分析。长石溶孔、原生粒间孔和岩屑溶孔等为研究区长6储层主要发育的孔隙类型。运用Beard等对不分选情况下未固结砂实测的原始孔隙度计算公式,恢复得出研究区长6砂岩储层原始孔隙度平均为38.16%。在对成岩过程的研究中,发现对储层具有破坏性的成岩作用主要有机械压实作用和胶结作用,受两者作用影响,未固结砂岩72.9%的原生粒间孔被压实损失,这是造成研究区长6砂岩储层致密的首要原因,19.7%的孔隙被胶结作用所破坏。研究区内晚期的溶蚀作用较为发育,形成大量的长石溶孔、岩屑溶孔以及粒间溶孔使得孔隙度提高了20.9%,有效的改善了长6储层的物性特征。孔隙度计算过程中误差率为3.4%,颗粒分选系数的确定以及多期次成岩作用叠加是造成误差的主要因素。Based on the casting thin- sections,scanning electron microscopy,X- ray diffraction,rock image granularity analysis and other physical data,the diagenesis and porosity evolution of Chang 6 reservoir was analyzed by adopting the combination of qualitative analysis and quantitative calculation method. The dominating pore type of Chang 6 reservoir was feldspar- dissolved pore,inter- granular pore and lithic- dissolved pore. Using statistical relationship between original porosity and sorting coefficient,the Chang 6 reservoir sandstone original porosity was calculated and the average was 38. 16%. Mechanical compaction and cementation were destructive diagenesis,affected by this effect,the impact of compaction was greatest and its loss- rate of porosity was 72. 9%,this was the main cause of reservoir densification,and the loss- rate of porosity of cementation was 19. 7%. Dissolution of Chang 6was more development,it improved porosity about 20. 9%. In the process of calculation,the error rate was 3. 4%,the main influencing factor of the error rate was sorting coefficient of detrital rock and more stages of diagenesis.

关 键 词：储集空间 定量演化 长6储层 板桥—合水地区 

分 类 号：P588.2[天文地球—岩石学]