摘要:
利用综合录井和三维地震等资料,讨论了黄骅坳陷南部滩海区中生界划分,分析了中生界展布规律,并对中生界主要目的层进行了测井相、地震相特征分析,在此基础上进行了沉积相和亚相特征研究。研究区残留中生界的分布主要受印支期南北向挤压、燕山中期SE-NW向挤压和新生代右阶右行拉分的综合作用,中、下侏罗统在研究区的北区复背斜地势低洼处分布,残留体长轴方向近东西向展布,主沉降中心靠近东部,残留厚度从四周向中心增厚。南区缺失中、下侏罗统,三叠纪在南区分布在EW向原古生界隐伏背斜之上。研究区中生界主要目的层为下侏罗统,属于温暖湿润气候条件下的曲流河沉积体系,曲流河沉积可分为河道亚相和河漫滩亚相,河道亚相砂砾岩成分和结构成熟度高,具有良好的储集性,河漫滩沼泽亚相一般为细颗粒沉积,通常作为盖层。
Abstract:
We discuss the stratigraphic division and study the distribution characteristic of Mesozoic of the south tidal land in Huanghua depression by using logging and seismic data. Then we probe into the lithofacies,logging facies and seismic facies of the Mesozoic strata. On the basis of these researches,we study the facies and sub-facies of the Mesozoic main target strata. Distributions of Mesozoic are mainly controlled by Indo-China SN extrusion, Yanshan SE-NW extrusion and Cenozoic dextral pull-dispartment. J1-2 is distributed only in low-lying multi-anticline in the north zone,and is absent in south zone of the research area. The long axes of the residual Mesozoic strata are EW trending. Triassic is distributed in the south zone,centralizing and concealed in Paleozoic anticline with EW trending. The depo-center of J1-2 is close to the east section and the residual depth of Mesozoic is incrassate from circumambiency to the deposit-center. The Mesozoic main target strata are lower-Jurassic which is of meander river facies formed in humid-, semi-humid weather condition. Meander river facies can be divided into stream channel sub-facies and alluvial flat sub-facies. The fabric and constituent maturity of conglomerate of stream channel sub-facies is fine, and so can act as reservoir,while the alluvial flat sub-facies is fine sediments and can be cap rock.
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