摘要
针对杭锦旗地区东部下石盒子组圈闭类型复杂,气藏类型不明,圈闭充满度差异大以及储量动用难等问题,利用储/地比值和渗透率变异系数对砂体宏观非均质性进行表征,确定了储/地比值和渗透率变异系数的界线值,以此为依据重新划分圈闭类型发育的区域。在圈闭类型划分的基础上,以什股壕区带西部构造-岩性复合圈闭为例,分析了影响圈闭充满度的因素。研究结果表明:1)宏观非均质性整体上呈现南强北弱的趋势,研究区南部以渗透率变异系数>0.5、储/地比值<0.3为主,储层非均质性强,平面连通性差;北部以渗透率变异系数<0.5、储/地比值>0.3为主,储层整体较为均质。2)盒1段的储/地比值>0.3区域物性好,层内遮挡性差,主要依靠构造控藏,此处主要发育构造圈闭气藏。3)储/地比值<0.3区域物性差,层内遮挡性好,有利于岩性圈闭气藏的发育。4)影响构造-岩性复合圈闭充满度的主要因素有烃源岩的距离、圈闭上覆直接盖层及储层沉积微相等。以上成果认识为下一步油气勘探工作推进以及提高储量动用率提供支撑。
Aiming at the problems of complex trap type,unknown gas reservoir type,large difference of trap filling degree and difficult reserve utilization in the Lower Shihezi Formation in the eastern part of Hangjinqi Area,the reservoir/land ratio and permeability variation coefficient were used to characterize the macro heterogeneity of sand body,and the boundary values of reservoir/land ratio and permeability variation coefficient were determined,on which the regions of trap types were reclassified.Based on the classification of trap types,taking the structure-lithology compound trap in the western part of the Shiguhao Area as an example,the influencing factors of trap filling degree are analyzed.The results show that:1)The macroscopic heterogeneity tends to be stronger in the south and weaker in the north,in the southern part of the study area,the permeability coefficient of variation>0.5 and the reservoir/land ratio<0.3 are the main reservoirs with strong heterogeneity and poor plane connectivity;In the northern part,the permeability coefficient of variation<0.5 and the reservoir/land ratio>0.3 are the main reservoirs with relatively homogeneity.2)He1 section reservoir/land ratio>0.3 area has good physical property,poor intra-layer shielding property,mainly relying on structural control,and structural trap gas reservoirs are mainly developed here.3)The reservoir/land ratio<0.3 area has poor physical property and good intra-layer shielding,which is conducive to the development of lithologic trap gas reservoir.4)The main factors affecting the filling degree of structure-lithology composite trap are related to the distance of source rock,the direct overlying cap rock and the sedimentary microfacies of reservoir.The above results provide support for further oil and gas exploration work and increase the utilization rate of reserves.
作者
成立
CHENG Li(Exploration and Development Research Institute of Sinopec Shanghai Ocean Oil&Gas Branch,Shanghai 200120,China)
出处
《非常规油气》
2023年第4期47-57,共11页
Unconventional Oil & Gas
基金
中国石油化工股份有限公司科技部科研项目“鄂尔多斯盆地晚古生代盆地原型与油气成藏过程研究”(P21088-2)。
关键词
宏观非均质性
圈闭类型
储/地比
渗透率变异系数
充满度
主控因素
macroscopic heterogeneity
trap type
reservoir/land ratio
permeability variation coefficient
fullness
main controlling factors
