库车坳陷克拉苏构造带断圈含气性影响因素及目标优选

Comprehensive evaluation on petroliferous potential of the fault traps in the Kelasu structural belt of Kuqa depression

为了优选库车坳陷克拉苏构造带的有利钻探目标断圈,基于已钻的16个断圈,从天然气的供给条件、运聚条件、保存条件3个方面系统分析克拉苏构造带断圈含气性影响因素,在该基础上采用聚类分析方法,对11个目标断圈与已钻断圈进行了相关性分析,最终实现了有利钻探目标优选。研究表明,影响断圈含气性的因素包括8个方面,即烃源岩供烃能力、断裂类型分布、断裂走向变化规律、断裂转换带类型、断裂输导效率特征、断盖配置关系、断储产状配置关系和断层侧向封闭性。根据离差平方和聚类分析方法将断圈归为4类,其中第1类中的克深8号和第3类中的克深10号断圈钻探风险相对最小,是下一步钻探的有利目标。

Favorable fault traps were optimized for drilling in the Kelasu structural belt of Kuqa depression based on correlation analyses of 16 drilled traps and 11 target traps in respects of gas supply,migration,accumulation,and preservation conditions by using cluster analysis.The result shows that the influencing factors on the petroliferous potential of the fault traps include hydrocarbon generation capacity,fault type and distribution,variation of fault strike,type of fault transform zone,fault transport efficiency,configuration relationship of fault and cap rock,occurrence relationship of fault and reservoir,and fault lateral seal.According to cluster analysis of the sum of squares of deviations,the fault traps were divided into 4 categories.Of which,the Keshen 8 fault trap of Category I and the Keshen 10 fault trap of Category III are relatively less risky and are favorable drilling targets.