浅水三角洲相控储层预测研究——以松辽盆地中央坳陷大安地区泉四段为例  

Shallow-water deltaic facies-controlled reservoir prediction study: A case study of the Quantou Formation in the Da’an Area of the Central Depression, Songliao Basin

作　　者：王于恒 于福生[1,2] 李忠诚 王晓坤[4] 熊连桥 齐伊梨 冯桢鸣 WANG Yuheng;YU Fusheng;LI Zhongcheng;WANG Xiaokun;XIONG Lianqiao;QI Yili;FENG Zhenming(School of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;CNPC Jilin Exploration and Development Research Institute,Songyuan,Jilin 138001,China;CNPC Huabei Exploration and Development Research Institute,Renqiu,Hebei 062500,China;CNOOC Research Institute Ltd.,Beijing 100028,China;CNOOC Shanghai Ltd.,Shanghai 200335,China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油吉林油田分公司勘探开发研究院,吉林松原138001 [4]中国石油华北油田公司勘探开发研究院,河北任丘062500 [5]中海油研究总院有限责任公司,北京100028 [6]中海油有限公司上海分公司,上海200335

出　　处：《中国矿业大学学报》2024年第3期564-584,共21页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(42072144);大安油田大42区块扶余油层油藏精细描述研究项目(JS2021-W-13-JZ-33-45)。

摘　　要：三角洲前缘相变迅速,沉积演化复杂,储层分布多变,利用常规地震切片及钻井分析等传统方法无法有效分析其沉积演化规律和储层分布.为提升浅水湖盆三角洲储层预测精度与沉积模式刻画准确度,本文以三维地震反演为基础,综合钻井信息,通过密井网解剖和地层切片,重建大安地区白垩系泉四段沉积演化过程,定量表征储层分布范围.研究表明:构造稳定、地形平缓及湖平面不断波动的沉积背景下形成浅水三角洲,该三角洲经历由早期粗粒厚砂的平原至晚期细粒薄砂的前缘沉积演化过程,内部还有多期次级水体进退;沉积物主要为河道、河口坝及溢岸沉积的复合型砂坝,其宽厚比为35~225,彼此间可构成垂向孤立、叠加式、侧向叠加和替代式.随湖平面升高与水体能量减弱,砂坝推进距离减少,弯曲度增加,两侧溢岸沉积逐渐消失,倾向于在末端逐渐分叉形成指状形态;强水动力下则更易形成低曲度的枝状形态,倾向于在末端形成交织网状形态.沉积相控与属性约束可完成无井区或稀井区储层定量预测,砂厚预测准确率可达89.93%,为储层预测提供新思路与新方法.The frontal transition of the delta in the shallow-water lake basin is rapid, with complex sedimentary evolution and variable reservoir distribution. Conventional methods such as seismic slicing and well analysis are ineffective in analyzing the sedimentary evolution patterns and reservoir distribution. To enhance the accuracy of reservoir prediction and the precision of sedimentary model characterization in the shallow-water lake basin delta, the sedimentary evolution process of the 4th member of Quantou Formation in the Cretaceous of the Da'an area is reconstructed based on 3D seismic inversion, integrating well information, and dissecting and slicing the formations through a dense well network. The study quantitatively characterizes the range of reservoir distribution. The results show that under a sedimentary background of stable tectonics, gentle terrain, and fluctuating lake levels, a shallow-water delta is formed. The delta undergoes sedimentary evolution from early plain deposition of coarse-grained thick sands to later frontal deposition of fine-grained thin sands. Multiple lake-level advances and retreats also occur internally. The sand bodies mainly consist of sand-dam-type composite sedimentary bodies formed by river channel deposition, estuarine dam deposition, and overflow deposition, with width-thickness ratios ranging from 35 to 225. These bodies can form vertically isolated, superimposed, and replacement patterns. With the rise of lake level and reduced water energy, the advancing distance of sand dams decreases, curvature increases, and overflow deposition on both sides gradually disappears. The formations tend to gradually bifurcate at the end, forming a finger-like morphology. Under strong water dynamics, low-curvature branching forms more easily, tending to form an interlaced network morphology at the end. Reservoir quantification prediction in non-well areas or sparsely well areas is achieved through sedimentary facies control and attribute constraints. The accuracy of sand thickness predict

关 键 词：浅水三角洲沉积模式 波形指示反演 沉积相控储层分布 松辽盆地中央坳陷区 

分 类 号：P512.2[天文地球—地质学]