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惠州凹陷位于珠江口盆地北部坳陷带中部,是南海东部海域最富烃的凹陷之一。惠州凹陷古近系文昌组钻井资料少,勘探程度低,单纯依靠单井相分析来进行沉积相的平面研究比较困难。通过对三维地震剖面的精细对比分析,将惠州凹陷A断层转换带文昌组地层划分为SQ1~SQ4等4个地震层序。通过对A断层转换带地震相的研究,在地震剖面上识别出了楔状地震相、前积(侧积)地震相、席状平行~亚平行地震相和透镜状地震相,并确定了地震相在平面上的分布范围。在对单井钻遇文昌组地层的各层序沉积相进行深入研究的基础上,结合区域地质背景,将平面地震相转化为沉积相,对文昌组各层序沉积相分布及演化特征进行了分析,确定了本地区主要发育辫状河三角洲、扇三角洲、滨~浅湖及中~深湖相沉积,其中辫状河三角洲是本地区占主导地位的沉积相类型。
Huizhou Sag is located in the central part of the northern depression belt of the Pearl River Mouth Basin and is one of the most hydrocarbon-rich depressions in the eastern South China Sea. The Paleogene Wenchang Formation in Huizhou Sag has less drilling data and low exploration degree. It is difficult to study the plane of sedimentary facies based on single-well facies analysis. Through the detailed comparison and analysis of 3D seismic profiles, the Wenchang Formation strata in the A-fault transition belt of Huizhou Sag are divided into four seismic sequences, SQ1-SQ4. Based on the study of the seismic facies of fault A, the wedge-shaped seismic facies, pre-product (lateral product) seismic facies, parallelepiped-parallel seismic facies and lenticular seismic facies are identified and the seismic facies Distribution in the plane. Based on the deep study of the sedimentary facies of each sequence stratigraphic sequence of the Wenchang Formation in single well and the regional geological background, the plane seismic facies is converted into sedimentary facies, and the sedimentary facies distribution and evolution characteristics of Wenchang Formation are studied The main sedimentary braided river delta, fan delta, foreshore-shallow lake and middle-deep lake facies in this area were identified and analyzed. Braided river delta is the dominant sedimentary facies in this area.