裂缝性储层试油层段选择的方法探讨  

A DISCUSSION ON THE METHOD FOR SELECTING OIL PRODUCTION TEST INTERVALS OF FRACTURED RESERVOIR

作　　者：张荣义[1] 李瑜[1] 

机构地区：[1]中国石油西南油气田分公司重庆气矿科研所

出　　处：《天然气工业》2001年第1期90-93,共4页Natural Gas Industry

摘　　要：文章通过对裂缝性储集层的容积系数所反映裂缝性储层储渗性能、并与储层产能间存在密切关系的认识 ,根据修正后的裂缝孔隙度计算公式 ,对裂缝孔隙度进行重新计算 ,建立了h·φf 与QAOF的幂函数关系式 ,从而达到对储层产能进行量化评价目的。文中以裂缝性储层试油井层相对较多的沙罐坪构造为例 ,根据 8口获气井及4口微气井的测井资料 ,计算其 φf 及h·φf 值 ,探讨并建立了h·φf—QAOF关系式 ,该式可进行产能预测。此外 ,根据储量规范中对不同深度气井工业气流下限的规定 ,将该下限值扩大 4倍转换为不同深度气井的QAOF下限后代入上式求出各工业气流下限值时的h·φf 下限值 ,再将计算出的h·φf 值与相应井深范围内的h·φf 下限值进行比较 ,当评价层h·φf 大于产工业气流的h·φf 下限值时 ,确定其为试油层段 ;否则将其排除在试油层段以外。该方法使裂缝性储层的评价由定性判断变为定量评价 ,避免了靠定性认识选择试油带来的盲目性 。Based on the knowledge of the fractured reservoir's storage/permeability performance reflected by the volumetric factors of fractured reservoir and the close relation between the storage/permeability performance and the productivity of reservoir as well as according to the formula modified for calculating fracture porosity,the fracture porosity is re calculated and the relational expression of h·φ f and Q AOF power function is set up,achieving the goal of the quantitative evaluation of reservoir.In this paper, taking the Shaguanping structure where there are relatively more fractured reservoirs under oil production test for example and according to the logging data of eight gas producing wells and four wells with slight gas production, the value of φ and h·φ f is calculated and the relational expression of h·φ f and Q AOF is discussed and set up,which can be used for productivity prediction.In addition,according to the low limit of commercial gas flow of the gas wells with different depth fixed in the'reserves standard',through substituting this low limit value which is enlarged by four times and converted to the low limit of Q AOF of the gas wells with different depth into above mentioned formula,the low limit values of h·φ f at the low limits of different commercial gas flows are acquired, and then ,the calculated h·φ f values are compared with the low limit values of the h·φ f within respective well depths. When the h·φ f of evaluated interval is greater than the low limit value of the h·φ f of the interval producing commercial gas flow,it is defined as oil production test interval ; otherwise it gets rid of the interval for oil production test.This method makes the evaluation of fractured reservoirs changed from the qualitative judgement to the quantitative evaluation , avoiding the blindness in selecting interval for oil production test by relying on qualitative knowledge and being conducive to raise the success

关 键 词：裂缝性 储集层 孔隙度 容积法 四川盆地 试油 油气勘探 

分 类 号：TE344[石油与天然气工程—油气田开发工程]