松辽盆地深层地质结构及致密砂砾岩气勘探

发布时间：2019-03-05 08:20

【摘要】：基于全盆地野外露头、钻井、地震资料及地球化学分析数据,研究了松辽盆地深层地质结构特征、断陷基本地质规律、沙河子组致密气成藏地质条件及下步勘探方向。通过系统对比分析,明确盆地深层地质结构表现为下断上坳的双层结构,断陷期以断裂或地层超覆与隆(凸)起为界、由隆(凸)起相互间隔的断陷独立发育。与断陷形成演化相关的断裂可分为区域深大断裂、基底控陷断裂和洼内次级断裂3类,阐明了3类断裂在断陷群形成演化中的作用。结合区域构造和盆地演化特征分析,明确致密砂砾岩气、火山岩和基岩潜山等3大勘探领域,沙河子组致密砂砾岩气是目前最具勘探前景的战略新领域。在沙河子组基本石油地质特征分析基础上,提出砂砾岩是沙河子组碎屑岩储集层优势岩类,母岩成分、沉积结构、沉积相带及成岩作用是砂砾岩有利储集层主控因素。沙河子组气藏属典型自生自储型,发育岩性和构造两种气藏类型,陡缓两带有利沉积相带控制储集层展布、岩性圈闭形成及气藏规模,断陷内部次级断裂控制构造圈闭的形成及天然气的富集。通过综合评价优选出7个沙河子组致密砂砾岩气勘探最为现实的断陷。
[Abstract]:Based on the field outcrop, drilling, seismic data and geochemical analysis data of the whole basin, the characteristics of deep geological structure of Songliao Basin, the basic geological law of fault depression, the geological conditions of tight gas reservoir formation in Shahezi formation and the next exploration direction are studied. Through systematic comparison and analysis, it is clear that the deep geological structure of the basin is a double-layer structure of the lower fault-upper depression. The fault-depression period is bounded by faults or strata overburden and uplift (uplift), and develops independently from uplift (uplift) to each other. The faults related to the formation and evolution of fault depression can be divided into three types: regional deep and large faults, basement controlled faults and subsag secondary faults. The role of the three types of faults in the formation and evolution of fault depression groups is clarified. Based on the analysis of regional structure and basin evolution characteristics, it is clear that tight sand-gravel gas, volcanic rock and bedrock buried hill are three major exploration fields. Tight sand-gravel gas in Shahezi formation is the most promising strategic field at present. Based on the analysis of the basic petroleum geological characteristics of the Shahezi formation, it is suggested that the sand conglomerate is the dominant rock group in the clastic reservoir of the Shahezi formation, the parent rock composition, the sedimentary structure, the sedimentary facies zone and the diagenesis are the main controlling factors of the favorable reservoir in the Shahezi formation. The gas reservoir of Shahezi formation belongs to the typical self-generating and self-storage type, which develops two types of gas reservoirs, lithologic trap formation and gas reservoir scale, and the lithologic trap formation and gas reservoir scale are controlled by the favorable sedimentary facies zone of steep and slow two zones. The secondary faults in the fault depression control the formation of structural traps and the enrichment of natural gas. Through comprehensive evaluation, the most realistic fault depression for gas exploration of tight sand-gravel rock in Shahezi formation has been selected.
【作者单位】：中国地质大学(北京)海洋学院;中国石油勘探开发研究院廊坊分院;
【基金】：国家自然科学基金项目(40772075) 国家重大科技专项(2011ZX05007)
【分类号】：P618.13

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