Reservoir characteristics and superior lithology sequences of metamorphic buried-hill at BZ19-6,Bohai bay Basin
All the rock thin sections,conventional physical properties and other data from more than ten wells in BZ19-6 block,Bohai sea were comprehensively analyzed.The lithology division scheme of metamorphic rock in this block,including granitic gneiss,cataclastic rock and granulite was constructed.The results show that the content of light minerals(mainly quartz and feldspar)of this lithology is very high,and the content of dark minerals(biotite,etc.)is low,respectively.The effect reservoirs contain micro-cracks and intragranular dissolved pores.When the content of quartz is between 25%and 35%,and the ratio of plagioclase/(plagioclase+alkali feldspar)is between 0.4 and 0.6;The cataclastic rock,monzonitic gneiss,monzonitic mixed granite and plagioclase mixed granite are the best metamorphic rocks forming good reservoirs,based on the high content of light minerals,high values of porosity and permeability.It shows that the superior lithology sequence is influenced by lithology in basically,but tectonic movement is also one of the main controlling factors.
万方数据
维普
