鄂尔多斯盆地长6-长7段致密砂岩岩心裂缝评价标准及应用  

Assessment Criteria for Member 6 and 7 Tight Sand in Ordos Basin and its Applications

作　　者：牛小兵[1,2] 侯贵廷[3] 张居增[1,2] 冯胜斌[1,2] 赵文韬[3] 尤源[1,2] 鞠玮[3] 王芳[1,2] 张鹏[3] 

机构地区：[1]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [2]长庆油田分公司勘探开发研究院,陕西西安710018 [3]教育部造山带与地壳演化重点实验室,北京大学地球与空间科学学院,北京100871

出　　处：《大地构造与成矿学》2014年第3期571-579,共9页Geotectonica et Metallogenia

基　　金：中国石油天然气股份公司“鄂尔多斯盆地致密油勘探开发关键技术研究”重大科技专项(编号:2011E-2602)资助

摘　　要：鄂尔多斯盆地湖盆中心发育延长组长6-长7致密砂岩,其致密油具有很大的勘探开发潜力。本文基于107口井岩心构造裂缝的观察、测量和统计分析,建立了针对鄂尔多斯盆地湖盆中心的长6-长7致密砂岩的构造裂缝评价标准。目的是划分该盆地长6-长7致密砂岩构造裂缝发育的不同程度,尤其是裂缝面密度分布的差异性。通过裂缝综合评价柱状图的连井对比,发现鄂尔多斯盆地湖盆中心在纵向上和横向上裂缝发育程度均存在明显的差异性。长71段在陇东地区的东部和东南部以及庆阳地区附近的裂缝密度较大,而其他地区裂缝密度较小。长71段在陕北地区的东北部裂缝密度较大,而西南部裂缝密度较小。长72段在陇东地区庆阳-庆城-合水之间以及Z78井和正宁附近的裂缝密度较大,而在陇东地区西部和北部的裂缝密度较小。长72段在陕北的西部裂缝密度较大,其次是吴起地区西北部裂缝密度局部较大,而在其他地区裂缝密度很小。Member 6 and 7 tight sand of the Triassic Yanchang Formation are developed in the central Ordos basin of the North China craton, and have prospective exploration potential in tight sand oil and gas. The structural fractures assessment critera of Member 6 and 7 tight sands are proposed in this paper based on the measurement, statistics and analysis of fractures in the cores sampled from 107 wells. The goal is to search for the difference in the horizontal and vertical structural fracture assessment columns. High density of fractures of Member 71 is developed in the eastern and southeastern Longdong area, especially in Qingyang where the density of fractures, is the highest. High density of fractures of Member 71 is developed in the northeastern Shanbei, higher than that of the southwestern Shanbei area. High density of fractures of Member 72 is developed among Qingyang, Qingcheng and Heshui, especially near the Z78 and Zhengning area, but the density of fractures in the western and northern Longdong areas is rather low. The highest density of fractures of Member 72 is developed in the western Shanbei, and the second-highest density of fractures is seen in the northwestern Wuqi area, whereas the density of fractures is very low in the other areas of the central Ordos basin.

关 键 词：鄂尔多斯盆地 长6-长7段 致密砂岩 构造裂缝 裂缝评价标准 

分 类 号：TE121[石油与天然气工程—油气勘探] P542[天文地球—构造地质学]