Dolomite genesis and reservoir-cap rock assemblage in carbonate-evaporite paragenesis system

HU Anping,SHEN Anjiang,YANG Hanxuan,ZHANG Jie,WANG Xin,YANG Liu,MENG Shaoxing

Table 1 Types of reservoir-caprock combinations in carbonate rock - gypsum salt sedimentary system.

Climate variation Reservoir Caprock Humid→ dry (subsalt) Abrupt climate variation Limestone Microorganism/bioclastic limestone Gypsum salt rock Dolomite Microorganism dolomite Gypsum dolomite Microorganism dolomite+gypsum dolomite Limestone+ dolomite Microorganism limestone/bioclastic limestone+microorganism dolomite Microorganism limestone/ bioclastic limestone+gypsum dolomite Gradual climate variation Microorganism limestone/bioclastic limestone+microorganism dolomite+gypsum dolomite Dry→ humid (supersalt) Abrupt climate variation Limestone Microorganism limestone/bioclastic limestone Tight carbonate rock or clastic rock Dolomite Microorganism dolomite Gypsum dolomite Gypsum dolomite+Microorganism dolomite Limestone+ dolomite Microorganism dolomite+microorganism limestone/bioclastic limestone Gypsum dolomite+microorganism limestone/bioclastic limestone Gradual climate variation Gypsum dolomite+microorganism dolomite+microorganism limestone/bioclastic limestone