鄂尔多斯盆地姬塬地区长2油层组储层孔隙结构特征

Characteristics of reservoir pore structure in Chang 2 oil-bearing bed in Jiyuan Area, Ordos Basin

胡作维 2 黄思静 2 马永坤 2 吕杰 2 朱炳光 2

成都理工大学油气藏地质及开发工程国家重点实验室，四川 成都 610059 成都理工大学沉积地质研究院，四川 成都 610059

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China

孔隙结构特征是油气储层综合评价和精细描述的核心研究内容之一，也是油气勘探与开发中必不可少的重要基础资料。根据岩石薄片、常规物性及高压压汞等资料的分析结果，文中系统研究了鄂尔多斯盆地姬塬地区长2油层组储层砂岩的孔隙结构特征及综合分类。结果表明：姬塬地区长2油层组砂岩主要以富含长石的砂岩类型为主，储层总体属于中孔特低渗孔隙型储层，多数孔喉半径集中在微细孔喉的范围，孔喉分布均质性和均匀程度较差，总体孔隙结构较差、产油能力较低；同时这些砂岩孔隙结构可分为好、较好、中等、较差、差等5类，中等孔隙结构最为典型。

The study on pore structure characteristics is one of the core contents in the integrated evaluation and detailed description of oil and gas reservoirs. It can also provide the basic data for the petroleum exploration and development. Based on the analysis of rock thin sections, routine physical properties and high-pressure mercury injection, this paper systematically studied the pore structure characteristics and classification of reservoir sandstones in Chang 2 oil-bearing bed in Jiyuan Area, Ordos Basin. The results show that the reservoir sandstones are mainly the feldspar-rich sandstone type and the reservoirs have mid-porosity and ultra-low permeability with micro-fine throat sizes, poor homogeneity and uniformity, poor overall pore structure and low oil production capacity. The pore structures of sandstones can be divided into five types: good, slightly good, moderate, slightly poor and poor. In them, the moderate pore structure is the most typical one.

10.6056/dkyqt201205010