莫尔图克油田侏罗系浅水三角洲沉积特征  

Sedimentary characteristics of Jurassic shallow water delta in the Mortuk Oilfield

作　　者：王娜 曲福俊 周德阳 刘洪利 张有印 WANG Na;QU Fujun;ZHOU Deyang;LIU Hongli;ZHANG Youyin(Research Institute of Petroleum Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamy,Xinjiang 834000,China)

机构地区：[1]中国石油新疆油田勘探开发研究院,新疆克拉玛依834000

出　　处：《中国科技论文》2025年第2期125-136,共12页China Sciencepaper

摘　　要：莫尔图克油田盐上油藏侏罗系为一套陆源碎屑沉积,目前尚不清楚该区砂体的分布特征、不明了沉积相类型、油藏开发方向。通过岩心、薄片、测井及地震等资料,结合区域沉积背景,对莫尔图克油田盐上油藏侏罗系沉积特征进行研究。研究表明:1)莫尔图克油田侏罗系沉积时期构造相对稳定,地形平缓,气候温暖湿润,以细粒沉积为主,为发育褐煤与大量碳化树木残余的浅水三角洲沉积。2)侏罗系沉积时期区域古地理格局为东高西低,结合邻区对比分析判断物源方向为南东方向。3)该区垂向上发育多期砂体,砂体之间相互切割、叠置,局部区域连片分布,单一砂体厚度薄,横向变化快,以正韵律为主,叠合砂体厚度较大,反韵律砂体少见,且厚度较小。4)该区共识别出三角洲平原、三角洲前缘、浅湖-前三角洲3类亚相,水上分支河道、河漫与水下分支河道、支流间湾、河口砂坝等微相,微相类型以水下分支河道微相为主,河口砂坝发育程度非常低或不发育。分析了砂体平面展布特征及影响因素,结合生产特征,优选有利的油气储集相带,为后期油田规模开发提供了方向。The Jurassic reservoirs above the salt in the Mortuk Oilfield are a set of terrigenous clastic sediments.Currently,the distribution characteristics of sand bodies in this area are still unclear,and the type of sedimentary facies and the development direction of the reservoirs remain undetermined.By utilizing data from core samples,thin sections,well logging,and seismic data,combined with the regional sedimentary background,this study investigated the sedimentary characteristics of the Jurassic reservoirs above the salt in the Mortuk Oilfield.The main research findings are as follows.1)During the Jurassic sedimentation period in Mortuk Oilfield exhibits relatively stable tectonics,gentle terrain,and a warm and humid climate.The predominant sedimentation consisted of fine grains,forming shallow-water delta deposits with the development of lignite and abundant remnants of carbonized trees.2)The regional paleogeographic pattern during the Jurassic sedimentary period is characterized by a high east and low west topography,and the provenance direction is determined to be in the southeast direction based on comparative analysis of adjacent areas.3)Multiple sand bodies are developed vertically in this area,intercutting and overlapping each other,and distributed contiguously in local areas.The thickness of a single sand body is thin,with fast lateral changes,mainly characterized by positive rhythm.The thickness of superimposed sand bodies is relatively large,while that of reverse rhythm sand bodies is rare and small.4)Three types of subfacies are identified in this area,including delta plain,delta front,shallow lake-front delta,as well as microfacies such as subaqueous branching channels and river overflows and subaqueous branching channels,inter tributary bays,and estuarine sandbars.The microfacies are mainly underwater branching channel microfacies,and the development degree of estuarine sandbars is very low or not developed.The analysis of the planar distribution characteristics of sand bodies and their influencing fac

关 键 词：莫尔图克油田 侏罗系 砂体特征 物源方向 浅水三角洲 

分 类 号：P618.13[天文地球—矿床学]