松辽盆地南部金山气田成藏模式及气藏主控因素分析

Analysis of Gas Accumulation Mode and the Major Controlling Factors of Jinshan Gas Field in Southern Songliao Basin

为分析气藏的主控因素并明确有利储层的展布,结合区域地质背景及测录井、地震等资料,分析了金山气田的烃源岩、储集层、盖层的特征和展布以及油气运移通道的方式。金山气田的烃源岩有机碳含量较高,有机质类型以腐殖型Ⅲ型为主;储层物性呈低孔低渗致密特征,油气运移通道主要以断裂和连通砂体为主。总结了该气田的成藏规律并初步建立了成藏模式:金山气田为下生上储、断砂输导、盖层封堵的成藏模式,沙河子组为最有利的储集层发育层位。据此综合分析了研究区的构造特征、沉积砂体特征,结合完钻井的试气试采动态资料开展了储层发育影响因素研究,并对该气藏的主控因素进行了分析。研究表明,金山气田储层具有河道控砂、微相控储和层状分布的特征,气藏具有岩性控藏、差异聚集和丰度控产的特征,以此指导有利储层展布规律认识和井位部署。

In order to analyze the major control factors to the reservoirs and clarify its distribution,guided by regional geological background and combined with geologic logging and well logging and seismic data,the characteristics and distribution of source rock,reservoir and caprock and the migration modes of oil and gas in Jinshan Gas Field are analyzed.The content of organic carbon is higher and the type of organic matter is dominated by humic typeⅢ.The reservoir physical property is characterized by low porosity and low permeability,and the oil and gas migration channel is mainly dominated by the fractured and connected sand bodies.Studies show that the accumulation mode is that source rock is located in the lower position and reservoir is placed in upper position,the migration is through fault and sand,sealing is through caprock,where Shahezi Formation is the most favorable reservoir development layer.The characteristics of structure and sedimentary sand are comprehensively analyzed and combined with the data of gas testing and its trial production in well drilling,the factors influencing the reservoir development are studied in the area,the major reservoir control factors are analyzed.The results indicate that the reservoirs in Jinshan Gas Field has characters of sand being controlled by channels,reservoir being controlled by microfacies and distribution in layer,the gas reservoir has the characters of reservoir being controlled by lithology,gas accumulation being different and production being controlled by abundance,it provides a guidance for the understanding of favorable reservoir distribution regulations and deployment of well locations.