准噶尔盆地低幅度背斜圈闭识别方法——以盆5井区圈闭为例  

Approach to Low-Amplitude Trap Identification in Junggar Basin——An example of trap at Peng-5 Wellblock

作　　者：李学义[1] 李天明[1] 王兵[1] 薛冽[1] 徐群洲[1] 

机构地区：[1]中国石油新疆油田分公司勘探开发研究院地球物理研究所,乌鲁木齐830011

出　　处：《新疆石油地质》2005年第2期199-201,共3页Xinjiang Petroleum Geology

摘　　要：随着准噶尔盆地勘探的深入,圈闭识别的难度越来越大,低幅度背斜圈闭的识别已成为人们关注的对象。以准噶尔盆地盆5井区圈闭识别为例,根据钻井结果和地震解释引发的矛盾,精细分析表层速度特征、地震速度资料,建立速度模型:利用模型正演和速度拟合以及速度模型建场方法,对盆5井区进行了重新构造成图研究。研究结果表明,盆5井区闭合面积应为40km2,闭合度应为40m,而不是5.6km2和12m,高点位置偏移4km,这一研究成果已被钻井所证实。The stratigraphic trap identification is becoming more and more difficult with progressing petroleum exploration in Junggar basin. How to find the low-amplitude traps in it? Taking P-5 Wellblock in Junggar basin as an example, this paper examines the inconsistence between drilling and seismic interpretation for its low-amplitude trap identification, and includes the detailed analysis of subsurface velocity feature and seismic velocity data and the development of the velocity model. With the model showing forward modeling and velocity field modeling, remapping of the structure in P-5 Wellblock is made. The result shows that the existing trapping area becomes larger than before, and high spot moves four km toward southwest, which has been confirmed by drilling.

关 键 词：圈闭 背斜 准噶尔盆地 速度模型 表层速度 地震解释 正演 钻井 勘探 地震速度 

分 类 号：TE122[石油与天然气工程—油气勘探] P631[天文地球—地质矿产勘探]