摘要
为了说明鄂尔多斯盆地东部上古生界碎屑岩储层特征 ,对其岩性特征、储集空间类型、物性特征几方面进行了研究。研究结果表明 ,上古生界碎屑岩储层广泛发育 ,共发育千5、盒3 、盒7、盒8、山1、山2 、本1段 7个储层段 ,在浅层千5、盒3 段见到中孔高渗储层发育区 ,物性较好 ,但分布局限。岩性以岩屑砂岩为主 ;孔隙类型主要为粒间溶孔和晶间孔 ;对孔隙形成具建设性的成岩作用是溶蚀作用。物性总体上低孔低渗。将储层分为四类 ,Ⅰ、Ⅱ类较好 ,Ⅲ、Ⅳ类较差。评价出神木—佳县、起鸡哈浪—大河塔—余兴庄区块为储层有利发育区。
The lithological features and petrophysical properties and the type of storage space were studied in order to indicate the characteristics of Upper Paleozoic clastic rock reservoirs in East E'erduosi Basin.The results studied show that 7 clastic rock reservoir members as P 2q 5,P 2h 2 3,P 1h 1 7,P 1h 1 8,P 1s 1,P 1s 2 and C 2b 1 are widely developed in Upper Paleozoic and the medium-porosity and high-permeability reservoirs with good petrophysical property but a local distribution have been found in the shallow layers as P 2q 5 and P 2h 2 3;the reservoir beds are mainly composed of lithic sandstones chiefly containing intergranular solution pores and intercrystalline pores and an advantageous diagenesis for forming pores is corrosion;the reservoir beds are petrophysically characterized by low-porosity and low-permeability in general;and they may be divided into 4 types,Types I and Ⅱ being fairly good and Types Ⅲ and Ⅳ being relatively poor.Finally,the Shenmu-Jiaxian and Qijihalang-Daheta-Yuxingzhuang regions are evaluated as the beneficial reservoir distribution areas in the paper.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2002年第6期27-30,共4页
Natural Gas Industry
