统八 meaning in English

tohachi

First of all , the substance foundation of low - rank coal cbm generation in the basin has been discussed according to the development of coal reservoir , coal petrography , coal properties , coal rank , coal genera , coal facies feature of lower jurassic badaowan formation ( jlb ) and middle jurassic xishanyao formation ( j2x )
首先，根据下侏罗统八道湾组( j _ 1b )和中侏罗统西山窑组( j _ 2x )煤储层发育、煤岩、煤质、煤级、煤类、煤相地质特征论述了本区低煤级煤层气生成的物质基础。
Three sets of source rocks had been formed juring the steady sinking of the basin . the first source rock , being clay and calcium clay stone in tiemulike formation of permian was formed in deep lake environment ; the second source rock , being clay stone in xiaoquangou group of middle to upper triassic was formed in the offshore and the shallow lake environment ; and the third source rock , being coal beds in badaowan formation of lower jurassic was formed in the lake - swamp environment . the first one is the most potential , since it has the biggest thickness , the highest organic matter abundance , high maturity and the highest hydrogen generating capacity
在盆地稳定沉降时期，相应地形成三套烃源岩，即上二叠统铁木里克组( p _ ( 2t ) )深湖、半深湖相泥岩、泥灰岩；中上三叠统小泉沟群( t _ ( 2 - 3xq ) )滨浅湖相泥岩及下侏罗统八道湾组( j _ ( 1b ) )湖沼相煤系地层。