塔北隆起西部库姆格列木群底砂岩段沉积特征

发布时间：2018-07-23 10:59

【摘要】：根据岩心观察、测井及粒度资料分析,研究古近系塔北隆起西部库姆格列木群底砂岩段的碎屑与蒸发盐类沉积特征,分析其演化规律。结果表明:研究区可识别三角洲前缘、滨浅湖、盐湖等沉积相类型,在盐湖环境下三角洲滑塌变形构造较发育且形式多样,波状层理和火焰状构造成因及表现形式特殊。三角洲可划分为进积和退积两种旋回,盐湖可划分为扩张和萎缩两种旋回;受湖平面控制,底砂岩段4个砂组发育3期三角洲,表现为一个进积到退积的旋回,其中3砂组三角洲向盐湖推进最远,盐湖面积最小,而1砂组初期,三角洲完全退出研究区,盐湖面积最大,三角洲和盐湖沉积存在进退耦合关系。该研究结果为塔北西部碎屑岩油气勘探开发提供依据。
[Abstract]:Based on core observation, well logging and granularity analysis, the detrital and evaporative salt sedimentary characteristics of the bottom sandstone member of the Qumgarimu Group in the western part of the Paleogelian uplift are studied, and its evolution law is analyzed. The results show that the study area can identify the sedimentary facies types such as delta front, littoral shallow lake, salt lake and so on. In salt lake environment, the deformational structure of delta collapse is relatively developed and various forms, and the formation and manifestation of wave-like bedding and flame-like structure are special. Deltas can be divided into precession and retrogradation cycles, salt lakes can be divided into two cycles of expansion and atrophy, and controlled by lake level, the four sandstones in the bottom sandstone segment are developed into three stages of delta, showing a cycle from progradation to retrogression. Among them, the delta of 3 sand formation advances furthest to the salt lake and the area of the salt lake is the smallest, while in the early stage of the first sand formation, the delta completely exits from the study area, the area of the salt lake is the largest, and there is a coupling relationship between the delta and the salt lake deposit. The results provide a basis for the exploration and development of clastic rocks in the western part of Tarim Basin.
【作者单位】：贵州中地大热能科技有限公司;湖北地大热能科技有限公司;中国地质大学(北京)海洋学院;
【基金】：国家自然科学基金项目(40372056)
【分类号】：P618.13

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