The pore structure of tight limestone-Jurassic Ziliujing Formation, Central Sichuan Basin, China  

作　　者：Liu Yun-Long Zhang Yuan-Zhong Wang Yong-Jun Wang Li-Geng 

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China [2]PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China

出　　处：《Applied Geophysics》2018年第2期165-174,361,共11页应用地球物理（英文版）

基　　金：The work was supported by the National Natural Science Foundation of China （No. 41374144）, the National Key Basic Research Program of China （973 Program） （No. 2014CB239201）, and SINOPEC Key Laboratory of Geophysics.

摘　　要：The pore structure of the tight limestone in the Daanzhai Member of the Ziliujing Formation, Jurassic System, in central Sichuan Basin, China, is complex but essential to the exploration and development of tight oil. The pore structure of the tight limestone is studied by using scanning electron microscopy （SEM）, nitrogen adsorption, high-pressure mercury intrusion, and nuclear magnetic resonance （NMR）. The experimental results suggest that the pores are mainly slit pores and mesopores and macropores contribute to the pore volume and specific surface. The displacement pressure, average pore size, and homogeneity coefficient correlate with porosity and permeability and can be used to evaluate the pore structure. The full pore-size distribution was obtained by combining nitrogen adsorption and high-pressure mercury intrusion. We find that the limestone mainly contains mesopores with diameter of 2-50 nm. The T2 distribution was converted into pore-size distribution, well matching the full pore-size distribution. The relation between T2 and pore size obeys a power law and the geometric mean of T2 correlates with the pore structure and can be used in the pore structure evaluation.在 Ziliujing 形成的 Daanzhai 成员的紧密的石灰石的毛孔结构，侏罗记系统在中央四川盆，中国，对紧密的油的探索和发展复杂却必要。紧密的石灰石的毛孔结构被使用扫描电子学习显微镜学(SEM ) ，氮吸附，高压的水银侵入，和原子磁性的回声(NMR ) 。试验性的结果建议毛孔主要是裂缝毛孔和 mesopores 和 macropores 贡献毛孔卷和特定的表面。排水量压力，平均毛孔尺寸，和有孔和渗透和罐头的同质系数相互关联被用来评估毛孔结构。完整的毛孔尺寸分发被联合氮吸附和高压的水银侵入获得。我们发现石灰石主要与 250 nm 的直径包含 mesopores。T ₂ 分发被变换成毛孔尺寸分发，很好匹配完整的毛孔尺寸分发。在 T ₂ 和毛孔尺寸之间的关系与毛孔结构和罐头遵守一条幂定律和 T ₂ 相互关联的几何平均数在毛孔结构评估被使用。

关 键 词：Tight oil LIMESTONE pore structure nitrogen adsorption mercury intrusion nuclear magnetic resonance 

分 类 号：TF3[冶金工程—冶金机械及自动化]