滨里海盆地东缘石炭系碳酸盐岩台缘带识别及展布特征  

Identification of Carboniferous carbonate platform margin and itsdistribution characteristics in the eastern margin of the Pre-Caspian Basin

作　　者：郭凯 范乐元 金树堂 程晓东 盛善波 吴嘉鹏 GUO Kai;FAN Leyuan;JIN Shutang;CHENG Xiaodong;SHENG Shanbo;WU Jiapeng(China National Logging Corporation,PetroChina,Beijing 100101,China;Aktobe Company of International Exploration&Production Corporation,PetroChina,Aktobe 030000,Kazakhstan)

机构地区：[1]中国石油测井有限公司,北京100101 [2]中油国际阿克纠宾油气股份公司,哈萨克斯坦030000

出　　处：《石油地质与工程》2023年第3期23-30,共8页Petroleum Geology and Engineering

基　　金：国家科技重大专项“全球油气资源评价与选区选带研究”(2016ZX05029)。

摘　　要：滨里海盆地东缘X区块以二维地震资料为主且钻井资料有限,分析沉积相带及展布特征对于评价该区勘探潜力及优化勘探部署具有重要意义。在明确区域构造沉积背景的基础上,通过地层厚度变化、剖面地震相分析及平面波形分类等方法开展石炭系KT-Ⅱ段台地边缘相带识别,明确了相带展布及有利区分布范围。研究表明,该区KT-Ⅱ段Γ层东部发育具多个建隆区的台地边缘,是下部Д层缓坡台地上发育起来的沉积型镶边台地。自西向东地震反射主要由平行-亚平行反射、亚平行-丘形反射向丘形-斜交型前积反射变化,反映了由台内到台缘斜坡的相带变化特征。东部台缘带以中弱振幅、中低连续与中高频反射为主,而西部台内则相反,台缘带北东向展布大于45 km,宽约5~9 km。有利相带分布及储层发育受台地边缘演化控制明显,主力层Γ层下部有利相带主要为西部台内滩,而上部有利相带主要为东部台缘藻丘滩与颗粒滩,其次为西部台内滩。Block X in the eastern margin of the Pre-Caspian basin is dominated by 2D seismic data and few drilling data.The analysis of sedimentary facies and distribution characteristics is of great significance for evaluating the exploration potential and optimizing the exploration deployment in this area.On the basis of clarifying the regional tectonic-depositional background,the platform margin of Carboniferous KT-II member was identified by means of stratum thickness variation,sectional seismic facies analysis and planar waveform classification.The results show that the platform margin facies with multiple sedimentary uplift zones occurs in the easternΓlayer of KT-II member,which is part of sedimentary rimmed platform developed after carbonate ramp ofДlayer forming lower KT-II member.From west to east,the seismic reflection configuration varies from parallel-subparallel,subparallel-mounded to mounded-inclined progradation reflection,reflecting the facies variation from interior platform to the platform margin slope.The eastern platform margin belt is dominated by medium to weak amplitude,medium to low continuity and medium to high frequency reflection,while the western platform is on the contrary.The platform margin belt extends more than 45 km in northeast direction and is about 5~9 km wide.The distribution of favorable facies belt and reservoir development are obviously controlled by platform margin evolution.It is considered that the favorable facies belt of the lowerΓlayer is mainly grainstone beach in the western interior platform,while the favorable facies belt of the upperΓlayer is mainly the algal mound beach complex and grainstone beach in the eastern platform margin,followed by the western interior platform beach.

关 键 词：滨里海盆地 石炭系 台地边缘 地震反射构型 波形分类 

分 类 号：TE121.1[石油与天然气工程—油气勘探]