摘要
在岩心观察、铸体薄片、扫描电镜、同位素分析的基础上,对鄂尔多斯盆地东部二叠系太原组灰岩进行了研究。太原组灰岩沉积于陆表海潮坪环境,储集岩主要由(含)生物碎屑泥晶灰岩、泥晶生物碎屑灰岩和生物碎屑灰岩组成。储集空间可分为原生孔隙、次生孔隙和裂缝3 大类,次生成因的溶蚀孔、缝是最重要的储集空间。压实作用和胶结作用是主要的破坏性成岩作用,溶蚀作用和岩溶作用是主要的建设性成岩作用,由于岩溶作用,使得灰岩的次生溶孔、缝发育。储层以特低孔渗为特征,孔隙结构普遍较差,非均质性较强,根据其结构特征分为3大类:溶孔型、裂隙—溶孔型和裂隙型。古岩溶和裂缝的发育有利于有效灰岩储层的形成。
In order to find out the natural gas in new sections and new horizons to provide a stable and sufficient gas source for 'West-to-East Natural Gas Transmission', a research on the Taiyuan Formation limestone of Permian in East E'erduosi Basin was carried out on the basis of analyzing the data on core observation, cast thin section, scanning electron microscope and isotope assay. The Taiyuan Formation limestone was deposited in an epicontinental sea tidal-flat environment and its reservoir rocks are mainly conposed of bioclastic micrites, micritic bioclastic limestones' and bioclastic limestones. The reservoir rooms may be divided into three types, i. e. primary pores, secondary pores and fractures, and the secondary solution pores and fractures are the most important reservoir rooms. The compaction and cementation are the main destructive diageneses but the corrosion and karstification are the main constructive diageneses. The secondary solution pores and fractures caused by the karstification are well developed in the limestones. The reservoir is characterized by extra-low porosity and extra-low permeability with poor pore structure and strong heterogeneity. According to pore structure, the reservoirs may be divided into three types, i. e. solution pore type, fracture-solution pore type and fracture type. The development of palaeokarsts and fractures is beneficial to the formation of effective limestone reservoirs.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第4期16-18,共3页
Natural Gas Industry
