摘要:
经镜下成岩特征分析,哈得逊地区石炭系含油气储集层,可划分为六种成岩岩相。其中,薄砂层由致密混合型胶结相和非致密混合型胶结相组成;东河砂岩由溶蚀相、原生孔隙相、溶蚀—原生孔隙相和碳酸盐胶结相组成。其储集性能也随成岩相的不同而变化,椐物性分析评价,溶蚀相为Ⅰ1类特好储集层,原生孔隙相和溶蚀—原生孔隙相为Ⅰ2 类好储集层,非致密混合型胶结相与碳酸盐胶结相中的非致密型为Ⅱ类中等储集层,致密混合型胶结相和碳酸盐胶结相中的致密型为Ⅲ类较差储集层。在此基础上,依据相应的测井参数模式,对全区八口井进行了分析研究,除了获得各成岩岩相及储层类型在纵横方向上的展布特征外,应用溶蚀相的展布、成因及油气运移机理等特点,对新含油区进行了预测。
Abstract:
Research for the diagenetic lithofacies is based on sedimentary facies, which stress on the observation of diagenetic characteristics in sedimentary rock. Diagenetic lithofacies are distinguished and defined according to the differences of secondary diagenetic textures (including components of cements, cement types, fabric of contraction and solution, pore types and its distribution, etc.). On the basis of analyzing the micro-diagenetic characteristics, the thin sandstone in the middle-mudstone member and the Carboniferous Donghe sandstone are divided into six diagenetic lithofacies. The thin sandstone is composed of the compaction mixing cement facies and the non-compaction mixing cement face; the Donghe sandstone is composed of the solution facies, the primary pore facies, the solution-primary pore mixing facies and the carbonate cement facies. The quality of reservoirs changes with different diagenetic lithofacies. By analyzing and estimating, we conclude that the solution facies is best reservoir(Ⅰ 1), the primary pore face and the solution-primary pore mixing facies is good reservoir(Ⅰ 2), the non-compact cement facies and the non-compact type in the carbonate cement facies are medium reservoirs(Ⅱ), the compact cement facies and the compact type in the carbonate cement facies are bad reservoirs(Ⅲ). On the basis of this study, 8 wells are analyzed in this area by well logs models. As a result, we can see that the distribution of diagenetic lithofacies and different reservoir types distributed vertically and horizontally. Combining distribution characteristics of solution facies and its cause with migration of oil and gas and structure characteristics, we can predict the new oil-bearing area, and propose that the two high points of trap will be favorable for driuing at northwest and southwest from YW3 well, and very likely to gain industrial oil flow.
点击查看大图
下载:
