百色盆地浅层气判别方法研究

百色盆地浅层气是一重要的勘探目标,该地区部分气层因泥质含量较高电阻率较低,且中子密度孔隙度差异小,部分水层因地层水电阻率较大,造成储层电阻率较高,给流体性质的判别带来很多困难,测井解释常出现失误,以往的测井解释方法也不适用,判别符合率较低。针对储集层岩性和电性,选用不同的交会图版,结合常规资料对油气、水层的响应特点,形成一套储层流体判别方法,并开发出相应的处理程序。结果是,这些技术的广泛使用,使解释符合率显著提高,解释符合率达96%。该技术应用于生产,为天然气的开发提供了准确的依据,受到普遍欢迎,取得了较好的效果。

Study on the Identification Method for Shallow Gas in Baise Basin

Shallow gas is an important objective of exploration and development in Baise basin.As the resistivity in part of the gas zones is low because of high shale content and there is little difference between neutron density porosity,high formation water resistivity of part of water zones leads to high resistivity of reservoirs,whcih brings a great many difficulties to the identification of fluid property resulting in erroneous inter- pretation.Traditional well logging interpretation methods are not suitable.So the coincidence rate of identification is lower.Based on the lithology and electrical properties of the reservoir,a method is established to distinguish the properties of reservoir fluids by using different crossplots and the responses of conventional logging data.The application software for interpretation has been developed.The application of these technologies has improved the coincidence rate of interpretation up to 96%.The technology can provide accurate basis for gas devel- opment and is popular.It has achieved good result.