超深断控储集体储层连通性的地震描述方法  

Seismic description method for reservoir connectivity of ultra-deep fault controlled reservoirs

作　　者：龚伟[1] 张文文 GONG Wei;ZHANG Wenwen(Exploration and Development Research Institute of Northwest Oilfield Branch,SINOPEC,Urumqi 830011,China)

机构地区：[1]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011

出　　处：《复杂油气藏》2024年第2期162-168,共7页Complex Hydrocarbon Reservoirs

摘　　要：新疆塔里木盆地顺北地区发育埋藏深度超7000 m的碳酸盐岩断控缝洞储集体,储集体内部非均质性强,地震资料成像精度无法分辨和识别储集体内部储层结构。在无井或井之外储集体连通性无法描述的条件下部署井位,导致同一连通单元钻井数量过多,或钻井直接命中主体规模性储集体概率低,增加大型酸压作业导致勘探开发成本增加,制约了超深碳酸盐岩断控缝洞储集体油气藏高效勘探开发。针对现有碳酸盐岩断控储集体储层连通性识别描述方法应用范围存在的不足,提出了一种适用于超深领域无井区域的碳酸盐岩断控储集体储层连通性地震描述方法。首先应用地震最大似然属性及门槛值,结合属性井震标定或地质规律认识,通过三维雕刻获得断控储集体的空间轮廓。其次在断控储集体空间范围内通过地震均方根速度获取同一海拔深度任意两点的地层压力,比较这两点的压力差从而判断该两点之间储层是否具有连通性。这种利用同一个连通缝洞单元内同一深度地层压力相等原理描述储集体连通性的方法经生产验证是有效适用的,能够为其他地区相似地质目标的储层内部连通性判别提供可实施的技术流程和方法借鉴。In the Shunbei area of the Tarim Basin in Xinjiang,carbonate fault-controlled fracture-cavity reservoirs with a burial depth of more than 7,000 meters have been developed.The internal heterogeneity of the reservoirs is so strong that the imaging accuracy of seismic data cannot distinguish and identify the internal reservoir structures of the reservoirs.Deployment of wells under the condition that there are no wells or the connectivity of reservoirs outside the wells cannot be described,leading to an excessive number of wells drilled in the same connected unit,or a low probability of drilling directly hitting the main large-scale reservoir.As a result,the increase in large-scale acid pressure operations lead to the increase in exploration and development costs,which restricts the efficient exploration and development of ultra-deep carbonate fracture-controlled reservoirs.Given the shortcomings in the application scope of the existing methods of identification and describing the reservoir connectivity of carbonate fracture-controlled reservoir collectives,a seismic description method for reservoir connectivity of carbonate fracture-controlled reservoir collective is proposed to apply to the region without wells in ultra-deep areas.Firstly,the spatial contour of the fault-controlled reservoir is obtained through three dimensional engraving by using the seismic maximum likelihood attribute and the threshold value and combining with the attribute well earthquake calibration or the recognition of geological laws.Secondly,the formation pressure of any two points at the same elevation depth is obtained by the root mean square seismic velocity in the spatial range of fault-controlled reservoirs,and the pressure difference between the two points is compared to determine whether the reservoir between these two points has connectivity or not.This method of describing reservoir connectivity based on the principle of equal formation pressure at the same depth within the same connected fracture-cavity unit is effectively applic

关 键 词：断控缝洞储集体 储层连通性 碳酸盐岩 顺北油气田 塔里木盆地 

分 类 号：P631[天文地球—地质矿产勘探]