The Relationship between Diagenetic Evolution and Hydrocarbon Charge in Deep Tight Reservoirs: A Case Study from Kepingtage Formation of S9 Well Block in Tarim Basin

Figure 7

(a) Sample 5581.22, well S9, dissolved cleavage cracks of feldspar grain. (b) Sample 5508.72, well S901, partially dissolved feldspar grain. (c) Sample 5528.75, well S902H: quartz overgrowth occurs before calcite cement. (d) Sample 5584.75, well S9: the chlorite occurs as grain rimming and engulfed by quartz overgrowth. (e) Sample 5508.72, well S901: the quartz overgrowths are filled in the intergranular pores, and the chlorite is attached on the surface quartz overgrowth. (f) Sample 5584.75, well S9, chlorite film developed on quartz overgrowth. (g) Sample 5516.07, well S902H: occurrence of platy and fibrous illite. (h) Sample 5586.43, well S9: mixed layers of illite-smectite. Key: quartz overgrowth (Qtz-o), calcite (Ca), chlorite (Chl).

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