Reservoir characteristics of the first member of Middle Permian Maokou Formation in Sichuan Basin and its periphery and inspirations to petroleum exploration, SW China

SU Chengpeng,LI Rong,SHI Guoshan,JIA Huofu,SONG Xiaobo

Fig. 4. Reservoir space types of marl layers in LMAs of the Mao 1 Member in Sichuan Basin. (a) Well JH1, 2906.77 m, dissolved pores of matrix, plane-polarized light; (b) Well YY9, 1779.64 m, intragranular dissolved pores of bioclast and dissolved pores of matrix, cross-polarized light; (c) Well JH1, 2895.58 m, intragranular dissolved pores of bioclast and dissolved pores of matrix, plane-polarized light; (d) Well YY9, 1782.30 m, intragranular dissolved pores of dolomites, plane-polarized light; (e) Well JH1, 2896.40 m, intragranular dissolved pores of dolomite and intergranular dissolved pores, plane-polarized light; (f) Well JH1, 2893.80 m, microfracture, casting thin section; (g) Well JH1, 2906.88 m, fractures of grain margin and diagenetic pores and fractures of clay mineral, scanning electron microscopy (SEM) by argon ion polishing; (h) Well JH1, 2907.78 m, dissolution pores and cracks in grain of calcite, SEM by argon ion polishing; (i) Well JH1, 2901.92 m, pores within organic matter, SEM by argon ion polishing.