洛带气田遂宁组致密砂岩储层测井评价

LOGGING EVALUATION OF SUINING FORMATION TIGHT SANDSTONE RESERVOIRS IN LUODAI GAS FIELD

洛带气田遂宁组气藏储集类型以孔隙型为主,储层为特低—超低孔隙度、近致密—致密孔隙型储集层,平均孔隙度4.67%,渗透率0.402×10-3μm2。文章在简单描述遂宁组的基本地质特征基础上,着重分析了其在常规测井及成像、核磁特殊测井资料上的测井特征,总结出了在常规测井资料上的“四低一高”含气响应特征,即低自然伽马、低声波、低中子、相对低密度、高电阻率。利用常规测井资料,摸索总结了多种测井解释评价技术,对储层进行识别和评价,效果良好,测井解释符合率达到85.9%。

Suining Formation in Luodai gas field is a near-tight to tight porous gas reservoir, with an average porosity of 4.67% and permeability of 0.402×10 -3μm2. Based on a brief description of the basic geological characteristics of Suining Formation, their responses on conventional log and imaging log and NMR log are emphatically analyzed. The responses of gas reservoirs on conventional log are characterized by 'four-low and one-high', i.e. low GR, low AC, low CNL, low DEN and high RT. Based on conventional logging data, several logging interpretation techniques have been presented for identification and evaluation of reservoirs. The results are quite good and the coincidence rate of logging interpretation is up to 85.9%.