张道伟,马达德,伍坤宇,吴颜雄,夏晓敏,张审琴,张晓秋
Zhang Dao-wei,Ma Da-de,Wu Kun-yu,Wu Yan-xiong,Xia Xiao-min,Zhang Shen-qin,Zhang Xiao-qiu
摘要: 柴达木盆地致密油资源丰富,总资源量可达8.57×108t。近年来,英西地区湖相致密碳酸盐岩勘探取得突破,发现了规模储量。整体上,英西地区为一晚期隆起的大型背斜构造,纵向上具有“双层结构”特征,其浅层为受滑脱断层控制而形成断层传播褶皱,深层为复杂的冲断构造。英西地区下干柴沟组上段(E23)沉积期为咸化湖相环境,以盐岩层底为界,纵向上划分为盐间和盐下。盐下主要沉积泥质岩、碳酸盐岩和少量硫酸盐,同时也是优质烃源岩发育层段;盐间主要沉积了碳酸盐岩、盐岩和碎屑岩。该区烃源岩主要为一套深灰色灰质泥岩,其生烃母质以藻类为主,对烃产率贡献高达60%。储层总体为各种类型的灰云岩,普遍发育晶间孔,局部发育角砾化孔(洞)和溶蚀孔,平均孔隙度为6.2%,平均渗透率为0.61μm2。按照源—储配置关系可将油藏划分为两种类型,即盐下“自生自储”型和盐间“下生上储”型。研究和勘探实践证实,TOC、碳酸盐岩含量、储层孔隙度和脆性是“甜点”评价的重要指标,通过各主要参数的叠加分析对研究区甜点分布进行了分级评价。三维地震处理与解释、水平井多段多簇压裂等关键技术的应用实现了对英西地区致密碳酸盐岩油藏的有效动用。
中图分类号:
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