川西地区致密碎屑岩储层测井评价技术

川西地区油气勘探领域为陆相碎屑岩沉积地层,多年的油气勘探开发表明,该勘探领域具有储集岩石结构复杂、物性条件差、孔隙度及渗透率低、非均质性极强、流体分异规律不明显等特点,气水难以识别,传统的测井解释技术在多方面受到限制.针对川西储层的特点和预测难点建立形成了一套适合于川西致密碎屑岩储层的测井评价技术方法系列.对气层多参数综合判别技术、神经网络解释技术、储层非均质性评价技术、储层裂缝识别技术、天然气产能预测技术、地层弹性特征分析技术等进行了介绍,通过实例进行了效果评价.该方法技术在川西油气田的应用促进了川西天然气储产量的快速增长,且不仅适用于川西地区致密碎屑岩储层,而且可推广到其它类似的低孔低渗地层.

Logging Evaluation Technique for Tight Clastic Reservoir in Area of West Sichuan

Oil and Gas exploration area in West Sichuan is a continental clastic deposit. Many years of explorations and developments proved that the area has complex rock structure, poor physical property, low porosity and permeability, very strong anisotropy and non-clear hydro-differentiation, etc. Therefore, it is difficult to identify gas and water beds, the traditional logging interpretation techniques are limited in many ways. According to features of this area and reservoir predicting difficult points, established is a set of logging evaluation methods suitable for the compact clastic reservoir in West Sichuan. Introduced are the integrative discriminating technique for multi-parameters of gas-bearing bed and other methods such as neural network interpretation, reservoir anisotropy evaluation, reservoir fracture identification, gas productivity forecast and formation elasticity analysis, etc. Practical effect is evaluated through field log examples. Applications of the methods in West Sichuan oilfield help us obtain more significant log data about the reservoir there. The methods are not only adaptable to the tight clastic reservoir evaluation in West Sichuan gas & oil area, but also used in the other similar zones with low porosity and low permeability.