鄂尔多斯盆地高桥地区砂岩储层特征及影响因素

Sandstone Reservoirs Characteristics and Influencing Factors in Gaoqiao Region of Ordos Basin

高桥地区位于鄂尔多斯盆地南部，属于上、下古生界复合气藏，上古生界主力产气层段为二叠系石盒子组（盒8段）和山西组（山，段、山2段）砂岩储层。储层岩石类型以石英砂岩、岩屑石英砂岩为主，孔隙类型以溶孔为主，粒间孔和晶间孔次之，储层孔隙度在2．0％～10．0％之间，平均为83％，渗透率在0．1—1．0mD之间，平均为0．748mD，储层表现出低孔、低渗的特征。研究表明：压实作用是导致储层原生孔隙大量损失的主要原因，溶蚀作用是有效改善储层物性的主要因素．而胶结作用对储层具有双重作用，其中绿泥石环边胶结对储层有一定的保护作用。

The Gaoqiao area is located in south of Ordos basin, and belongs to tile compound gas reservoirs of Upper Palaeozoic and Ix）wet Palaeozoic. The main gas productive reservoir section is tile sandstone reservoir of Permian Shihezi Fomlation （He8 Member） and Shanxi formation （Shanl ,Shan2 Members）. The rocks of the reservoir are mainly classified into quartz sandstone and debris quartz sandstone. The pores are mainly classified into dissolution pores and inter-granular pores and inter-crystalline pores. The porosities of the reservoir are between 2.0% to 10.0%, and the average porosity is 8.3%; and the permeability is between 0.1 to 1.0roD, and the average permeability is 0.748 roD. The reservoir displays the properties of pores and low permeability. Research shows the compaction is the main reason causing the great loss of primary pores of the reservoir, the erosion is the main factor for effectively improving the physical property of the reservoir, and the cementation has double functions on the reservoir, wherein the chlorite rim cementation has a certain protective function on the reservoir.