吐鲁番坳陷北部七克台组的沉积与成岩作用

SEDIMENTATION AND DIAGENESIS OF QIKETAI FORMATION IN NORTH TURPAN DEPRESSION

刘林玉 柳益群 邸世祥

Liu Linyu Liu Yiqun Di Shixiang

吐鲁番坳陷北部七克台组发育扇三角洲沉积。扇三角洲前缘水下分流河道形成的碎屑岩体是扇三角洲沉积的主体部分,成为主要的油气储集体。储集层碎屑岩的岩石类型为岩屑砂岩和岩屑砂砾岩,其主要组分为凝灰岩和喷出岩岩屑。储集层在成岩过程中的主要成岩变化为机械压实作用、水化水解作用和胶结作用。碎屑岩在成岩作用改造下成为低孔低渗的致密型储集层。

Fan delta sediments developed well in the northern area of Turpan Depression.The subaqueous distributary channel clastic rock bodies in the fan delta front formed the main part of the fan delta and the most important oil and gas reservoirs.The clastic rocks of the reservoir are lithic sandstone and lithic sandy conglomerate.The major components of the reservoir clastic rocks are fragmental materials of tuff and extrusive rock.The main kinds of diagenesis are compaction,hydration and hydrolisis,cementation.The diagenesis made the clastic rocks of fan delta front to be dense reservoirs with low porosity and low permeability.

10.11743/ogg19980312