库车坳陷北带断裂输导天然气效率评价

Evaluation on gas transporting efficiency through fault in the north zone of Kuche Depression

在断裂输导天然气能力影响因素分析基础上，建立了断裂输导天然气能力评价参数。利用此评价参数对中国24个以断裂为主要输导通道的大中型气田断裂输导天然气能力进行了研究。井通过其天然气聚集效率和断裂输导天然气能力评价参数之间的关系研究得到：高效、中效和低效断裂输导天然气能力评价参数值应分别为大于250×10^-4、250×10^-4～25×10^-4和小于25×10^-4。根培库车坳陷北带断裂输导特征，对其下白垩统顶部断裂输导天然气效率进行了研究。得到库车坳陷北带下白垩统硕部高效断裂输导天然气区主要分布在大北1井周围、克拉1、2、3、4井周围和东秋5井-迪那2-依南2井周围3个地区，中、低效断裂输导天然气区围绕高效断裂输导天然气区分布。目前在该区发现的5个气田皆分布在高效断裂输导天然气分布区，表明高效断裂输导应是库车坳陷北带天然气成藏的重要条件。

Based on the analysis of factors that influence gas transporting efficiency through fault, one panameter to evaluate gas transporting ability through fault is established, with which the gas transporting ability through fault of 24 large and medium gas fields, where faults are the major transporting pathway, has been studied. The study of relationship between gas accumulation efficiency and evaluation parameter of gas transporting ability through fault points out ： evaluation parameter value of transporting ability though fault with high, middle and low efficiency is over 250×10^-4,250×10^-4 - 25×10^-4 and less than 25×10^-4, respectively. According to transporting characteristics through fat It in the north zone of Kuche Depression, gas transporting efficiency through fault in the lower Cretaceous top was studied. It is concluded that gas transporting area through fault with high efficiency would be among three regions around Well Dabei-1, Kelal-4 and Dongqou 5-Dina 2-Yinan 2, which are surrounded by the middle and low efficient gas tra 1sporting areas through fault. It is found that all the five gas fields distribute within gas transporting area through fault with high efficiency, indicating the high transporting ability should be an important factor for gas accumulating in the north zone of Kuche Depression.