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A凹陷普遍发育低孔渗油气藏,用单一测井方法难以有效的识别低孔渗储层油气水层,利用扫描电镜、偏光显微镜等对A凹陷B气田岩石铸体薄片进行观察认为压实作用、自生矿物的胶结作用和溶解作用是B气田P组和H组储层砂岩经历和发生的主要成岩作用,并认为沉积作用和成岩作用是低孔渗主要因素.在对A凹低渗成因分析的基础上,利用低孔低渗气水层测井综合识别方法,尤其是ΔSP*RT—(密度孔隙度-中子孔隙度)交会图综合考虑的泥浆侵入深度、地层物性特征、电阻率、密度及中子孔隙度等对天然气敏感的参数,对研究区流体性质识别具有重要的作用.结果显示气水层测井解释效果与试气资料对比其符合率有明显改善.
A depression generally develops low porosity and permeability reservoirs. It is difficult to effectively identify oil and gas reservoirs in low porosity and permeability reservoirs with a single well logging method. Observation of the rock castings in B gas field in A depression with scanning electron microscopy and polarized light microscopy is considered as compaction , The cementation and dissolution of authigenic minerals are the major diagenesis experiences and occurrences of sandstones in P and H formations of B gas field, and it is considered that sedimentation and diagenesis are the main factors of low porosity. Based on the integrated logging method of low porosity and low permeability gas reservoir logging, especially the ΔSP * RT- (density porosity-neutron porosity) cross-plot of mud invasion, formation physical property, resistivity, Density and neutron porosity, which are sensitive to natural gas, play an important role in the identification of fluid properties in the study area.The results show that the coincidence rate of gas-water logging interpretation with that of test gas is significantly improved.