首页> 中文期刊>大地构造与成矿学 >塔里木盆地克深2气田储层构造裂缝定量预测

塔里木盆地克深2气田储层构造裂缝定量预测

     

摘要

The Keshen-2 gas field is key exploration field in Kelasu Tectonic Belt of Tarim Basin where the Kela-2 and Dabei gas fields have been discovered.Structural fracture is an important factor controlling the physical property of low-permeability sandstone reservoir.Based on the analysis of essential characteristics of structural fracture,quantitative prediction on the spatial distribution of structural fractures in the Keshen-2 gas field is carried out by establishing mechanical model combined with numerical simulation of paleo-current tectonic stress field and quantitative calculation model of structural fracture parameters,and in the end,the distribution of structural fracture is established by synthesizing core description,imaging logging interpretation and quantitative prediction of structural fracture.The results show that fault belt is the plausible loci for fracture development,especially for reticular fractures with high filling extent,while the top of anticline has low structural fracture linear density but high physical property parameters and low filling extent which is strikingly in contrast with the wings of anticline and the low tectonic positions.Structural fracture can develop intensively in the saddle,but high filling extent restricts the gas production in this location.Vertically,with the increase of depth,linear density of structural fracture increases gradually while aperture and porosity reduce,which means the integral development extent drops down gradually.In conclusion,there is little difference between quantitative prediction and actual measurement of structural fractures.%塔里木盆地克深2气田是克拉苏构造带继克拉2气田和大北气田又一重点勘探领域,构造裂缝对改善该气田低渗透砂岩储层物性具有重要作用.在构造裂缝基本特征分析的基础上,通过建立力学模型,综合古今构造应力场的数值模拟以及构造裂缝参数定量计算模型,对克深2气田的构造裂缝空间分布规律进行了定量预测,最后综合构造裂缝的岩心描述、成像测井解释以及定量预测结果,总结了构造裂缝的分布规律.结果显示,断层带是构造裂缝的有利发育区,多发育充填程度较高的网状缝;背斜高部位的构造裂缝走向复杂,线密度较低,但开度和孔隙度等物性参数较高且充填程度低,整体发育程度较强,背斜翼部及构造低部位的构造裂缝整体发育程度较低;鞍部构造裂缝可密集发育,但较高的充填程度限制了该部位的天然气产量;垂向上随深度增加,构造裂缝线密度逐渐增大而物性参数逐渐减小,构造裂缝的整体发育程度逐渐降低.构造裂缝参数的定量预测结果与实测结果整体上一致,但受多种因素影响,仍然有一定的误差.

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