松辽盆地古中央隆起带基底岩性重磁震联合解释

发布时间：2018-02-14 02:50

本文关键词： 松辽盆地古中央隆起带重磁地震联合解释　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：深层天然气勘探已经在火山岩气藏和致密砂砾岩气藏获得突破,进一步拓展新层系、新领域是扩大天然气勘探场面及规模的亟需。松辽盆地古中央隆起带已获得尚未形成规模的天然气工业发现,是目前新领域探索的重点区域之一。本文依据松辽盆地周缘东、西、南部的野外露头、钻井岩心资料,建立了松辽盆地基底地层格架及地层层序,确定了松辽盆地古中央隆起带基底岩石类型。松辽盆地基底以石炭-二叠系为主,基底发育的岩石类型有凝灰岩、安山岩、花岗岩、泥岩、砂岩、砾岩、片岩、板岩、千枚岩、糜棱岩、碎裂碎斑岩等。通过大量野外岩石样品和钻井基底岩芯样品的地球物理参数测试,确定了盆地基底各种岩石类型的地球物理特征,划分出高密度的糜棱岩+千枚岩、中密度的花岗岩+安山岩+闪长岩、低密度低磁化率的碎裂花岗岩以及低密度的砂岩+砾岩+板岩+片岩四类岩石组合类型。结合3500-4000m、4000-4500m和4500-5000m等深视密度及视磁化率图,绘制3500-4000m、4000-4500m和4500-5000m等深基底岩性预测图。分析得出基底岩性分布特征:3500-4000m沉积岩覆盖区面积相对较大,基底呈南北连续贯穿的方式发育。基底岩性以花岗岩+安山岩+闪长岩的岩性组合为主,集中在研究区的中部以及南部;4000-4500m、4500-5000m深度段基底岩性以砂岩+砾岩+板岩+片岩的岩性组合发育最为广泛,其次为糜棱岩+千枚岩;糜棱岩+千枚岩和花岗岩+安山岩+闪长岩两种岩性组合,碎裂花岗岩发育面积最小,仅在区域各部分零星分布。为松辽盆地进一步开展油气勘探和有利目标区优选提供了科学依据。
[Abstract]:Deep gas exploration has made a breakthrough in volcanic gas reservoirs and tight sandy gravel gas reservoirs and further expanded the new strata. The new field is the urgent need to expand the natural gas exploration scene and scale. The Paleocentric uplift belt of Songliao Basin has been discovered in the unformed scale, which is one of the key areas in the exploration of the new field at present. This paper is based on the east of the Songliao Basin, the eastern part of the Songliao Basin. In the west and south of China, the basement stratigraphic framework and stratigraphic sequence of Songliao basin are established by outcrop and drilling core data, and the basement rock types of the paleocentric uplift belt of Songliao basin are determined. The basement of Songliao basin is dominated by Carboniferous and Permian system. The rock types developed in the basement are tuff, andesite, granite, mudstone, sandstone, conglomerate, schist, slate, phyllite, mylonite, The geophysical characteristics of various rock types in the basement of the basin have been determined through the geophysical parameter tests of a large number of field rock samples and core samples of the drilling basement, and the high-density mylonite phyllite has been classified. Four types of rock assemblages of medium density granite andesite diorite, low density and low magnetic susceptibility cataclastic granite and low density sandstone conglomerate slate schist. The prediction maps of the lithology of the deep basement, such as 4000-4500m and 4500-5000m, are drawn. It is found that the distribution characteristics of the basement lithology are relatively large in the overlying area of the sedimentary rocks: 1 / 3500-4000m. The basement is developed in a continuous way from north to south. The basement lithology is dominated by the lithologic combination of granite andesite diorite. The lithologic assemblage of sandstone conglomerate slate schist is the most extensive in the central and southern part of the study area, followed by mylonite phyllite. Mylonite phyllite and granite andesite diorite have the smallest developed area. Only scattered distribution in various parts of the region provides a scientific basis for further oil and gas exploration and favorable target area selection in Songliao Basin.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13;P631

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