| 辽中凹陷旅大16 油田东三段层序地层及沉积充填 |
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| 引用本文： | 黄 凯,秦 祎,刘宗宾,朱建敏,刘喜林,申婷婷.辽中凹陷旅大16 油田东三段层序地层及沉积充填[J].高校地质学报,2021,27(5):536-546. |
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| 作者姓名： | 黄 凯 秦 祎 刘宗宾 朱建敏 刘喜林 申婷婷 |
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| 作者单位： | 1. 中海石油（中国）有限公司 蓬勃作业公司，天津 300459；
2. 中国石油大学（北京） 地球科学学院，北京 102249
3. 中海石油（中国）有限公司 天津分公司渤海石油研究院，天津 300452 |
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| 摘 要： | 渤海湾盆地辽中凹陷旅大16油田东营组东三段是目前勘探开发的主力含油层系。综合三维地震资料、录井、测井及岩心资料，在井—震结合、层序地层学研究基础上，利用古地貌研究、岩心相、测井相、地震相和振幅属性切片分析，明确了东营组层序格架内沉积相类型、沉积展布特征及沉积演化规律。应用Vail的经典层序地层学理论，将东三段划分为一个三级层序，其中可识别出低位体系域、湖侵体系域和高位体系域。低位体系域沉积期，辽西低凸起大面积暴露遭受剥蚀，为研究区提供碎屑沉积物，发育近源的扇三角洲及重力流沉积体系。扇三角洲砂体以灰色中砂岩和细砂岩为主，河床滞留沉积、波状层理和生物扰动构造十分发育；高位体系域时期，辽西低凸起被淹没，供源能力减弱，研究区发育较远源的辫状河三角洲前缘沉积，且伴生重力流沉积。其中辫状河三角洲前缘水下分流河道砂体以细—中砂岩为主，见块状构造和楔状交错层理。重力流沉积体系主要为滑塌湖底扇及砂质碎屑流沉积，岩心观察可见细砂岩中发育滑塌变形构造，及漂浮状的砾石和泥岩撕裂屑。研究区沉积演化过程与地貌演化密切相关，且断裂体系对砂体展布具有控制作用，重力流沉积发育于断裂坡折前方。显然，明确沉积相类型、沉积展布特征及沉积演化规律，可为进一步油气勘探开发提供地质依据。
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| 关 键 词： | 层序地层 沉积体系 地震沉积学 东三段 旅大16油田 |
Sequence Stratigraphy and Sedimentary Filling of the Third Memberof the Dongying Formation in the LD16 Oilfield,Liaozhong Sag |
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| HUANG Kai,QIN Yi,LIU Zongbin,ZHU Jianmin,LIU Xilin,SHEN Tingting.Sequence Stratigraphy and Sedimentary Filling of the Third Memberof the Dongying Formation in the LD16 Oilfield,Liaozhong Sag[J].Geological Journal of China Universities,2021,27(5):536-546. |
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| Authors: | HUANG Kai QIN Yi LIU Zongbin ZHU Jianmin LIU Xilin SHEN Tingting |
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| Institution: | 1. Pengbo Oilfield Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300459, China;
2. College of Geoscience, China University of Petroleum (Beijing), Beijing 102249, China;
3. Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300452, China; |
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| Abstract: | The third Member of the Dongying Formation (Ed 3) in the LD16 oilfield in the Bohai Bay Basin is the main target for oil and gas exploration. Following the study of comparison of well and seismic and sequence stratigraphy, integrated analyses on paleogeomorphology, core facies, well-logging facies, seismic facies, and amplitude attribute slices were conducted based on 3-D seismic, well-logging, and core data to clarify the sedimentary facies, distribution and evolution. Using the classic theory Vail sequence stratigraphy, we recognized one third-order sequence stratigraphic unit within the Ed3, which can be divided into lowstand system tract (LST), transgressive system tract (TST) and highstand system tract (HST). During the LST and TST stages, the Liaoxi Uplift was subject to an intense erosion due to the exposure. Fan delta and gravity flow deposit systems were well developed along of sufficient sedimentary supply. The sand bodies of fan delta are mainly medium- and fine-grained sandstones with well-developed sedimentary structures of lag deposits, wavy bedding, and bioturbation. During the HST stage, the Liaoxi Uplift was submerged, and the capacity of the sedimentary supply was weakened. Therefore, braided river delta front and gravity flow deposit systems were developed in the study area. The subaqueous distributary channels of braided river delta consist of medium-fine-grained sandstone with wedge cross-bedding. The gravity flow deposits are mainly slump-induced sub-lacustrine fan deposits with deformed structures and sandy-debris flow deposits, which show sandstones with floating pebbles and mud clasts. The depositional evolution is closely related to the paleo-geomorphic evolution in the study area. In addition, fault systems control the distribution of sand bodies. The gravity flow sand bodies commonly developed in the front of the fault slope-break zone. The research on sedimentary facies, distribution and evolution is helpful for further hydrocarbon exploration in the study area. |
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| Keywords: | sequence stratigraphy sedimentary system seismic sedimentology third Member of the Dongying Formation LD16 oilfield |
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