CAJ | 학술논문

鄂尔多斯盆地长北气田山西组2段为一套海相辫状河三角洲沉积体系,为揭示不同时期小层砂体发育规模及空间分布,以高分辨率层序地层分析为基础,相控建模为指导思想,短期基准面旋回为地层单元,等时地层格架为约束条件,采用序贯指示数学方法对长北气田山2段4个短期层序的水上分流河道、水下分流河道及河口坝微相小层砂体的发育规模及空间分布进行了随机模拟.砂体展布的三维模拟结果表明,河道自北向南沿物源方向延展,其中SSC1～SSC4短期基准面上升时期,河道加宽,小层砂体沉积厚度加大,物性较好,有利储层发育;下降时期河道变窄,小层砂体沉积厚度减小,物性变差.小层砂体的三维模拟结果在该区勘探实践中得到了很好的验证.
악이다사분지장북기전산서조2단위일투해상변상하삼각주침적체계,위게시불동시기소층사체발육규모급공간분포,이고분변솔층서지층분석위기출,상공건모위지도사상,단기기준면선회위지층단원,등시지층격가위약속조건,채용서관지시수학방법대장북기전산2단4개단기층서적수상분류하도、수하분류하도급하구패미상소층사체적발육규모급공간분포진행료수궤모의.사체전포적삼유모의결과표명,하도자북향남연물원방향연전,기중SSC1～SSC4단기기준면상승시기,하도가관,소층사체침적후도가대,물성교호,유리저층발육;하강시기하도변착,소층사체침적후도감소,물성변차.소층사체적삼유모의결과재해구감탐실천중득도료흔호적험증.
The second member of Shanxi formation is a marine facies braid river delta sedimentary system in Changbei gas field,Ordos Basin.In order to reveal small layer sand body development scale and space distribution in different time,in this paper,taking high resolution sequence stratigraphic analysis as foundation,facies-controlling modelling as guiding ideology,short base-level cycle as formation unit and equitime stratigraphy framework as constraint condition,sequence indicator simulation method is used to simulate four short sequence braid river delta distributary channels,submerged distributary channels and river mouth bar small layer sand body development scale and space distribution on the second member of Shanxi formation in Changbei gas field.Sand body space distribute simulation result shows the channel flows from north to south and SSC1-SSC4 short base-level ascending phase is the best phase for sand body development.The channel width turned wider,sediment thickness increased,physical property turned to better,and these are good for reservoir to develop,but in descending phase,channel width turned thinner and small layer sand body thickness decreased.The small layer sand body three-dimensional simulation result gets a good validation according to actual exploration in this area.