A Preliminary Identification of Micro/Nano Scale Textures on Mineralization, Hydrocarbon Accumulation and Seismic Formation Structure

摘要

Observing specimens collected from the eastern China with SEM and TEM were performed for a preliminary identification of micro/nano scaled textures on mineralization, hydrocarbon accumulation and seismic formation structure. (1) Nanoscale gold grains groups developed in the mylonite zone from the Jinshan gold deposit can be incorporated into two types: concentrated grain group type and discrete grain group type; and the gold nanoscale grain (with a diameter D ranging from 15-35 nm) of the former is larger than the later (D, 4-8 nm). (2) Micro/nano pores (cracks) developed in the shale from Shenli and Changqing oil-gas field can be subdivided into four structure types: contraction micro/nano pore (crack) type; relaxation micro/nano pore (crack) type; exfoliation micro/nano pore (crack) type; and craze micro/nano pore (crack) type. (3) Micro/nano scale texture developed in the seismic formation zone from Haiyang fault zone and Tanlu fault zone can be classified into two types: line-granulation texture type with coseismic stick-slip in the principal slip zone (PSZ); and schistosegranulation texture type with aseismic creep-slip in the foliated slip zone (FSZ). Furthermore, we show that in deformational processes of the shearing developments, all of the three minor/nano size textures mentioned above underwent the same three stages: the nano-coating, nano-weakening and nano-delaminating, and they respectively occurred in different deformation stages.