蠡县斜坡中南部沙一段油藏主控因素及新成藏模式研究

Study on Main Controlling Factors and New Reservoir Forming Model of Es;Formation in Central and Southern Lixian Slope

蠡县斜坡是饶阳凹陷西部的一个西高东低大型沉积斜坡,油气富集,油气藏类型多。但斜坡中南部构造相对简单,断层较少,发现的油藏只零星分布于高部位的高阳及大百尺断层附近的G26-G29构造油藏和中、低部位的N52-N49构造-岩性油藏。针对该区构造圈闭落实困难、油藏成因多变、油水关系复杂、油藏类型认识不清等问题,采用精细刻画"隐伏断层"及低幅度"脊状构造"的方法,以油气成藏理论为指导,加强了油气分布规律及成藏主控因素研究,创新性地构建了"隐伏断层"控制下的低幅度"脊状构造"成藏模式。近期设计钻探N92x井获得成功,证实了以上成藏模式的可行性,为蠡县斜坡中南部的持续勘探及构造-岩性油藏的规模发现开辟了新思路。

Lixian slope is a large sedimentary slope with high west and low east in the western Raoyang Sag.It is rich in oil and gas and has many types of oil and gas reservoirs.The structures in the middle and south slopes are relatively simple and there are few faults.The discovered oil reservoirs are only distributed sporadically in the high G26-G29 structural reservoirs near the Gaoyang and Daibaichi faults and N52-N49 structure-lithologic reservoirs in the middle and low part of slope.In view of the problems such as difficult structural traps,variable reservoir formation causes,complex oil-water relationship and unclear reservoir types,the method of fine delineation of"concealed fault"and"ridge structure"with low amplitude is adopted to strengthen the study of oil and gas distribution law and main controlling factors of reservoir formation under the guidance of oil and gas accumulation theory.The low amplitude"ridge structure"reservoir formation model under the control of"concealed fault"was innovatively constructed.The recent successful drilling of well N92x has confirmed the feasibility of the above reservoir formation model,which opens up a new idea for continuous exploration and large-scale discovery of structure-lithologic reservoirs in the middle and southern part of Lixian slope.