摘要
将川东石炭系储层划分为中孔中渗（Ⅰ级）、中孔低渗（Ⅱ级）、低孔低渗（Ⅲ级）和超低孔渗（Ⅳ级）４级，提出以２％及５０％的孔隙度、含水饱和度界线划分储层和非储层，再依据储层级别及其所处气水界面以上位置，通过对比注入浮力与各级别毛细管阻力大小，来判断储层是否为有效储层的方法──浮力－毛细管阻力比较法。通过比较认为，Ⅰ级、Ⅱ级、ⅢＡ级、ⅢＢ级储层只要分别位于气水界面以上５ｍ，２５ｍ，６０ｍ和１００ｍ，即为有效储层。
Carboniferous dolomite reservoirs in East Sichuan could be divided into four grade: 1.middle porsity-middle permeability(grade-I ); 2. middle porosity-lower permeability (gradeⅡ ); 3. lower porosity-lower permeability (grade-Ⅲ ); 4. ultra low porosity-ultra low permeability (grade-Ⅳ).Reservoirs and nonreservoirs could be distinguished by 20% of porosityand 50% of water saturation. Based on the reservoir grades and their position above watergas boundary, the contrast of injected buoyance and different capillary pressures, a newmethod-bouyance-capillary pressure contrast method is proposed in this paper so as to determine a reservoir to be net pay one or not. The result suggests that the reservoirs ofgraded I above water-gas boundary 5 m,of grade-Ⅱ above the boundary 25 m, of grade-Ⅲ Aabove the boundary 60 m and of grade-Ⅲ B above the boundary 100 m are all net pay reservolrs.
出处
《石油与天然气地质》
EI
CAS
CSCD
北大核心
1996年第4期343-346,共4页
Oil & Gas Geology
