摘要
为尽快查明鄂尔多斯盆地苏里格庙地区的天然气资源 ,对其沉积相和储集层进行了深入研究。结果表明 :研究区二叠系山西组山 1、山 2段和下石盒子组盒 8、盒 9段发育一套以河流、三角洲和湖泊为主体的陆相碎屑岩沉积体系 ,在山西期以曲流河、三角洲平原、三角洲前缘和滨浅湖沉积为主 ,石盒子组盒 8、盒 9期发育辫状河、辫状河三角洲平原、辫状河三角洲前缘以及滨浅湖 ;石英砂岩、岩屑石英砂岩和岩屑砂岩是主要的岩石类型 ,成分成熟度较高 ,结构成熟度中等 ;孔隙分为原生孔隙、次生孔隙及裂缝 3类 ,其中以次生孔隙所占比例最高 ;孔隙度通常为 1 .8%～ 1 6.2 % ,渗透率变化大 ,最小 0 .0 1 6× 1 0 -3 μm2 ,最大 5 61× 1 0 -3 μm2 。根据物性、毛管压力等资料 ,划分了 , , , 类储层结构 ,其中 :盒 8气层组辫状河河道砂坝以 , 类储集岩为主 ,是本区最有利的储集相带 ;山 1气层组三角洲平原分流河道相和三角洲前缘水下分流河道相储集性能次之 ,主要为 ,
Suligemiao is located in the northwest of Ordos Basin. The sedimentary facies of Suligemiao area of the Permain contain stream facies, fluvial dominated delta facies and lake facies. Shan 1,Shan 2,He 8 and He 9 Formation of the Permain are main reservior of the study area. Shan 1 and Shan 2 Formation have developed meador rivor, delta plain, delta front and lacastrine. He 8 and He 9 Formation have developed braid, braid delta plain, braid delta front and lacastrine. Rock type of these formations contain quartzose sandstone, lithic fragment sandstone and lithic quartzose sandstone. Secondary compositional maturity and structural maturity is two of the characteristics of these sandstone. Pore type contains primary pore, secondary pore and cranny. Secondary pore is more than primary pore. Porosity often changes between 1.8 percent and 16.2 percent. Permeability changes greaty from 0.016×10 -3 μm 2 to 561×10 -3 μm 2. Based on analyzing the information of the charactristic of petrology, pore, pore canal, etc, the reservior texture is differentiated to four types, which includ Ⅰ type, Ⅱ type, Ⅲ type and Ⅳtype. Braid channel of He 8 Formation which belongs to Ⅰ type and Ⅱ type reservior is the best quality sedimentary context. Delta plain distributary channel and delta front subaquatic distributary channel of Shan 1 Formation which mainly belong to Ⅱ type and Ⅲ type reservior are the secondary reservior.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2002年第4期335-340,共6页
Journal of Northwest University（Natural Science Edition）
