珠江口盆地白云深水区深水水道沉积体系及成因模式

发布时间：2019-05-17 16:25

【摘要】：深水水道沉积是深水油气勘探开发中重要的沉积类型。利用高分辨率三维地震、钻测井等资料,通过地震资料综合解释和地质分析,对南海北部白云深水区珠江组上段发育的大型深水水道的展布特征及成因模式进行识别、刻画和预测。研究认为,该体系近SN向展布,具低弯度蛇曲形态,体系内发育3类深水重力流沉积单元,其中块体搬运沉积发育于白云凹陷东北端,呈丘状外形、内部杂乱反射特征,底部发育侵蚀擦痕;水道为体系主体搬运通道,按成因可分为侵蚀型、侵蚀/加积型和加积型,受控于物源供给及古地貌特征,具"上下分期,南北分段"发育特征,为典型的复合水道沉积构型,复合水道内叠置迁移关系复杂;位于水道前端的朵体发育于荔湾凹陷南部,剖面上表现为强振幅平行—亚平行反射,在平面上具有朵状特征。从古水深、古地形、触发机制及古源头沉积体系等方面综合分析,探讨了该深水水道体系的成因模式,推测古珠江三角洲为其主力物源,东沙隆起碳酸盐岩沉积为次级物源。这一研究对研究深水重力流沉积过程具有重要的参考价值。
[Abstract]:Deep water channel deposition is an important sedimentary type in deep water oil and gas exploration and development. Based on the high resolution 3D seismic and drilling logging data, through the comprehensive interpretation and geological analysis of seismic data, the distribution characteristics and genetic patterns of the large deep water channels developed in the upper section of the Pearl River formation in the Baiyun deep water area of the northern South China Sea are identified. Depict and predict. It is considered that the system is distributed in SN direction and has the form of low curvature serpentine. Three kinds of deep water gravity flow sedimentary units are developed in the system, in which the block transport deposition is developed at the northeast end of Baiyun sag, showing a mound shape and the characteristics of internal disorderly reflection. Erosion scratch is developed at the bottom; The waterway is the main transport channel of the system, which can be divided into erosion type, erosion / accumulation type and accumulation type according to its origin. It is controlled by the supply of provenance and paleogeomorphology, and has the characteristics of "upper and lower stages, north and south". It is a typical sedimentary configuration of composite waterway. The superimposed migration relationship in the composite waterway is complex. The flower body at the front of the waterway develops in the south of Liwan sag and shows strong amplitude parallel-subparallel reflection on the section, which has the characteristics of flowers in the plane. Based on the comprehensive analysis of paleo-water depth, paleotopography, trigger mechanism and paleo-source sedimentary system, the genetic model of the deep water channel system is discussed. It is inferred that the ancient Pearl River Delta is its main source and the carbonate deposit of Dongsha uplift is the secondary source. This study has important reference value for the study of gravity flow deposition process in deep water.
【作者单位】：甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室;中国科学院大学;山东科技大学地球科学与工程学院;
【基金】：国家科技重大专项子课题(编号:2016ZX05026-007-05) 国家自然科学基金(编号:41372134) 兰州油气资源研究中心“十三五”创新基金(编号:135CCJJ20160504) 甘肃省油气资源研究重点实验室开放基金(编号:SZDKFJJ20160602)联合资助
【分类号】：P512.2;P618.13

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