Abstract
Based on diagenetic evolution, reservoir diagenetic facies evolution was restored in burial history through quantitatively calculating the original porosity reconstructed by compaction, cementation and dissolution using core measurement data. The essence of this method was illustrated and its effectiveness was demonstrated using Paleogene lake sediment sandstone in Bozhong X oilfield, Bohai Bay Basin, China. Because diagenetic field changes as the structure depth increases or decreases and acts on deposition, diagenetic facies can be significantly different in different geological period. The Ed1 reservoir has experienced such an evolutionary process of W-Com_W-Cla-C_M-Car-C to M-Com_M-Clay-C_W-Qua-C_W-Fel-D_W-Car-D to M-Com_M-Cla-C_W-Qua-C_W-Fel-D_W-Car-D, while the Ed 2 , the Ed3 and the Es 1 are W-Com_W-Cla-C to M-Com_M-Cla-C-S-Com_S-Clay-C_W-Qua-C_W-Fel-D to S-Com_S-Cla-C_W-Qua-C_M-Fel-D, M-Com_W-Cla-C_W-Qua-C_W-Fel-D to M-Com_M-Cla-C_W-Qua-C_W-Fel-D to S-Com_M-Clay-C_W-Qua-C_S-Fel-D to S-Com_S-Clay-C_M-Qua-C_S-Fel-D and M-Com_W-Cla-C_W-Car-C to M-Com_M-Cla-C_W-Car-C_M-Fel-D_W-Car-D to M-Com_M-Clay-C_S-Fel-D_M-Car-D to S-Com_M-Cla-C _S-Fel-D_ M-Car-D respectively. Through this study, the reason for the dynamic change of sand body in the diagenetic field and the anisotropy of the reservoir are revealed.
Highlights
It is evident that porosity and permeability of clastic rock are closely related with diagenesis, and research on diagenesis has important significance for petroleum exploration and development (Rashid D.D., 1985; Craig E.M., 1994; Theodore T.M., 1996; Dacid B.B., 2001)
A new method is presented for diagenetic facies prediction of Paleogene lake sediment sandstone in Bozhong X Oilfield
The method is primarily based on the identification of diagenesis from core, which are closely correlated with porosity and permeability
Summary
It is evident that porosity and permeability of clastic rock are closely related with diagenesis, and research on diagenesis has important significance for petroleum exploration and development (Rashid D.D., 1985; Craig E.M., 1994; Theodore T.M., 1996; Dacid B.B., 2001). Diagenetic facies is a product of both diagenesis and diagenetic stages under the effect of tectonics, and the type of diagenetic facies is closely connected with rock particles, dissolution, cementation, fabric, pores and cracking. A naming scheme for diagenetic facies, such as low porosity and low porosity-coarse grained feldspar lithic sandstone-feldspar dissolution facies, has been proposed, a method taking lithology, diagenesis and pore permeability. Method taking lithology and main diagenesis into consideration describes diagenetic facies like this "sandstone- cementation facies", while single factor diagenetic facies emphasis the main diagenesis, for example, quartz secondary increase diagenetic facies. Some methods emphasize the diagenesis and diagenetic process, naming the diagenetic facies with important diagenesis that determines the physical characteristics of the reservoir, such as medium strong dissolving-middle glue formation facies (Grigsby J D et al, 1996; Elfigih et al, 1999; Xia Qinglong et al, 2012). Based on basis of previous studies, a new method is proposed through synthetical consideration of all diagenesis and its strength in different diagenetic stage
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