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川西坳陷中段下三叠统嘉陵江组层序地层及沉积相研究

发布时间:2018-03-20 05:09

  本文选题:川西坳陷中段 切入点:层序地层 出处:《西南石油大学》2015年硕士论文 论文类型:学位论文


【摘要】:川西坳陷中段地区位于四川盆地西部川西平原,属川西坳陷,面积大约8000km2。该地区最近几十年的油气勘探主要集中于中新生代陆相地层,并取得了较好的油气勘探成果,而海相油气勘探程度极低,仅有少数钻井钻至海相地层,川科1井钻至嘉三段完钻,获得少量的油气地质资料。紧邻的川东、川东北地区大规模的礁滩相储层及国内最大的海相气田——普光气田的发现,预示着基本处于同一沉积与构造背景的川西地区二叠-中三叠统具有巨大的油气勘探潜力。在该区获得的油气储量大都集中在川西坳陷周围,而在坳陷内部发现却较少,究竟是运移的影响,还是受沉积相控制,现今,人们对断裂的研究已经比较成熟,所以有必要对全区的沉积相进行系统的研究,以便重建古地理,恢复古环境,指导该区今后的油气勘探。本文采用层序地层学理论,紧密结合地震、钻井和野外露头资料,以Ⅲ级层序及其体系域为重点,对川西坳陷中段地区下三叠统嘉陵江组地层进行了层序划分,共划分出1个Ⅱ级层序、2个Ⅲ级层序(SQ1,SQ2)、4个体系域,并对各个体系域进行了详细描述;在Ⅲ级层序的基础上,进行了钻井、露头以及主要地震剖面的横向层序对比,建立了该地区的层序地层格架,并重点选择测线进行了地震相研究,以Ⅲ级层序及体系域为编图单元,参考地震反射波的外部形态、内部构型和物理参数等编图要素,分别编制了嘉陵江组嘉一、嘉二、嘉三、嘉四+嘉五段四个时期的岩相古地理图以及嘉陵江组地震相平面分布图。在此基础上,利用钻井和露头资料进行约束,将地震相和沉积相进行匹配转换,编制了四个时期的沉积相图,认为该区下三叠世嘉陵江期有利沉积相主要为台地边缘高能滩相,嘉二、三段颗粒白云岩储层发育,为有利的储集相带。结合成藏组合条件,指出有利区带。建议今后在该地区进行精细的地震地质及层序地层沉积相研究,为海相深层油气勘探打开良好局面。
[Abstract]:The middle segment of the western Sichuan depression is located in the western Sichuan plain of Sichuan Basin, which belongs to the western Sichuan depression and covers an area of about 8,000 km2. The oil and gas exploration in this area in recent decades has mainly concentrated on the Meso-Cenozoic continental strata, and has achieved good oil and gas exploration results. However, the degree of marine oil and gas exploration is very low. Only a few drilling wells have been drilled to marine strata, and Chuanke well 1 has been drilled to the third section of Jia-3 to obtain a small amount of oil and gas geological data. The discovery of large-scale reef and beach facies reservoirs in northeast Sichuan and the largest marine gas-Pu Guang gas field in China, It indicates that the Permian-Middle Triassic in the western Sichuan area has great potential for oil and gas exploration. Most of the oil and gas reserves obtained in this area are concentrated around the western Sichuan depression, but few are found in the inner depression. Whether migration affects or is controlled by sedimentary facies, nowadays, the study of faults has become more mature, so it is necessary to study the sedimentary facies of the whole area systematically in order to reconstruct paleogeography and restore paleoenvironment. In this paper, sequence stratigraphy theory is used to closely combine seismic, drilling and outcrop data, with emphasis on the order 鈪,

本文编号:1637640

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