准噶尔盆地西北缘斜坡区冲积扇储集层预测与效果
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摘要
准噶尔盆地西北缘上二叠统、下三叠统是重要的产油层系，储集层沉积相以冲积扇为主。冲积扇与油气的关系有“一扇一藏”之说，因此，预测冲积扇的分布很有意义。该区冲积扇可划分为断崖扇与坡积扇两大类。针对其特点，近年来形成了一套以传统地震地层学为指导的冲积扇预测方法，开展了断裂线和地层尖灭线展布、地震相分析、层速度分析、属性定量分析、井约束反演与解释等研究，并取得了非常显著的效果。先后发现并查明了６个冲积扇的规模及相带展布，提供评价井位１０口，地质预测符合率达９１８％，目前已有７口评价井获工业油流。
Upper Permian and Lower Triassic in northwestern margin of Junggar basin are important oil productive zones, with sedimentary facies dominated by alluvial fan. As the traditional saying goes“where there is alluvial fan, there is oil or gas”, it is therefore essential to predict the distribution of alluvial fan. The alluvial fan in this area can be classified into fault cliff fan and talus fan. In accordance with their characteristics, seismic stratigraphy was successfully used to predict it in recent years, which included the study of the distribution of fault line and pinchout line, seismic facies analysis, interval velocity analysis, quantitative analysis of property, well constrained inversion and interpretation. Six alluvial fans and their facies belt distribution were proved, ten appraised well location were determined, and the commercial oil flow has been obtained in seven appraised wells at present.
Upper Permian and Lower Triassic in northwestern margin of Junggar basin are important oil productive zones, with sedimentary facies dominated by alluvial fan. As the traditional saying goes“where there is alluvial fan, there is oil or gas”, it is therefore essential to predict the distribution of alluvial fan. The alluvial fan in this area can be classified into fault cliff fan and talus fan. In accordance with their characteristics, seismic stratigraphy was successfully used to predict it in recent years, which included the study of the distribution of fault line and pinchout line, seismic facies analysis, interval velocity analysis, quantitative analysis of property, well constrained inversion and interpretation. Six alluvial fans and their facies belt distribution were proved, ten appraised well location were determined, and the commercial oil flow has been obtained in seven appraised wells at present.
引文
［1］张伟，曲伟鹏轮南地区三叠系含油气储层横向预测，见：地震储层横向预测技术及实例，石油工业出版社（北京），1992，165～166［2］魏守刚用地震波阻抗和层速度的变化与孔隙度的关系探索储集层的规律，见：地球物理勘探北京（89）国际讨论会论文摘要，地矿部北京计算中心《地质信息技术》编辑部（北京），1989，370～373
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