浅水湖泊河口坝型三角洲前缘沉积特征与模式——以文安斜坡西5井区沙河街组三段为例

发布时间：2018-04-26 08:25

本文选题：湖泊浅水缓坡 + 河口坝型三角洲前缘　；参考：《东北石油大学学报》2017年04期

【摘要】：受控于不同的水流特征、物源供给和地形坡度,浅水三角洲河口坝发育程度和特征具有较大争议。以河北霸县凹陷文安斜坡西5井区沙河街组三段为例,采用井震心综合研究方法,以岩心相、测井相、地震相为标志,识别研究区浅水三角洲沉积微相类型;结合相对海平面升降变化,沉积微相、亚相的展布特征和演化规律,以及对古地貌和古水流分析其沉积控制因素和沉积模式,解释浅水河口坝型三角洲发育规律。结果表明:西5井区位于三角洲前缘末端,水动力较弱,砂泥比较低,河道相对稳定,属于缓坡河口坝型浅水三角洲,且地形坡度较缓、物源供给适中或不充分、水动力条件较弱、湖平面上升等因素控制浅水三角洲河口坝的发育程度。该结果对于厘清浅水三角洲河口坝形成的因素,指导该类型三角洲油气勘探开发具有重要的意义。
[Abstract]:Controlled by different characteristics of water flow, source supply and topographic slope, the development degree and characteristics of shallow water delta estuarine dams are controversial. Taking the third member of Shahejie formation in West 5 well area of Wenan Slope in Baxian Sag, Hebei Province as an example, using the comprehensive method of well center study, taking core facies, logging facies and seismic facies as marks, the sedimentary microfacies of shallow water delta in the study area are identified. The distribution and evolution of sedimentary microfacies and subfacies are combined with the changes of relative sea level, and the sedimentary control factors and sedimentary models of paleogeomorphology and paleocurrent are analyzed to explain the development law of shallow water estuarine dam type delta. The results show that the Xi5 well area is located at the end of the delta front, with weak hydrodynamic force, low sand and mud, relatively stable channel, and belongs to the shallow water delta of the gentle slope estuary dam type, and the topographic slope is relatively slow, and the material supply is moderate or insufficient. The hydrodynamic condition is weak, the lake level rises and other factors control the development degree of shallow water delta estuary dam. The results are of great significance to clarify the formation factors of estuarine dams in shallow deltas and to guide the exploration and development of oil and gas in this type of delta.
【作者单位】：中国地质大学(北京)能源学院;中国石油华北油田分公司;
【基金】：国家自然科学基金项目(41572080,41272132) 中国石油股份有限公司重大科技专项(HBYT-YJY-2015-JS-89)
【分类号】：P512.2;P618.13

【相似文献】