川西马井构造下白垩统含气性识别与评价

川西马进地区下白垩统含气性识别在测井解释上，主要在于储层含气水差异分辨较困难，气和水在测井曲线上的响应比较接近，过去解释的部分气层经测试却产水，常规的测井解释方法很将二者分开，以钻井录井显示和测试结果为依据，利用交会图分析技术，成功地对储层含气，水性质进行了识别，利用模糊聚类分析技术对含气性差异与念水性差异进行了判别，在此基础上，对含气性进行评价。

Identification of Gas-bearing Bed in the Lower Gretaceous System of Western Sichuan Majing Structrue and Its Evaluation

It is very difficult to identify gas-bearing bed in the lower Cretaceous system in the west of Sichuan Province because it is not easy to distinguish the gas-bearing beds from water-bearing beds，as well as the log response to gas and water is nearly the same．In addition，some reservoirs were interpreted as gas ones in the past，but they produced water during the well testing．Thereby，traditional log interpretation methods are not able to identify them desirably．Based on the mud logging and testing results，crossplot analysis is successfuly used in identitication of gas-bearing wand water-bearing reservoirs，and also，the difference between the gas-bearing and water-bearing bads is discriminated with fuzzy cluster analysis．On the besis of the above method，the gas-bearing bed is better evaluated．