Fluid geochemical features and preservation conditions of marine stratum in typical structure of Jianghan plain area

Abstract

Many scholars carried out large quantity of researches on oil and gas preservative conditions of marine carbonate rocks from the aspects of cap rocks, faults, formation water, hydrodynamic, and tectonism. This article gives dynamic evaluation on oil and gas preservative conditions of marine stratum in Jianghan (江汉) plain of multiphase tectonic disturbance from the view of paleofluid geochemistry. The conclusion shows that there mainly existed fluid filling of two periods in the reservoir of Lower-Middle Triassic to Permian. The fluid filled in the earlier period came from Lower Palaeozoic. The interchange of fluid in Lower-Middle Triassic to Permian suggested the oil and gas in Lower Palaeozoic had been broken up. The fluid filled in the later period (Lower-Middle Triassic to Permian) came from the same or adjacent strata and lacked anatectic fluidogenous features coming from Palaeozoic. With good preservative conditions of bulk fluid at the time, the fluid of Lower-Middle Triassic to Permian and that of Lower Palaeozoic did not connect with each other. However, the hydrocarbon generation peak of marine source rocks had passed or the paleo-oil and gas reservoirs had been destroyed at that time and the marine stratum of Palaeozoic to Triassic in the research area did not put out commercial oil and gas flow.

Keywords

fluid geochemistry / preservative condition of oil and gas / marine stratum / Jianghan plain

References

[1] Cao G. X., Luo X. P.. A Prelimininary Analysis on Hydrocarbon Preservation Condition of Marine Beds in Middle Yangzi Region. Oil & Gas Geology, 1996, 17(1): 44-47.

[2] Chen A. D., Huang J. M., Yang Z. W.. Application of Formation Water Data in Hydrocarbon Preservation Condition Evaluation. Southern China Oil & Gas, 2003, 16(2): 1-7.

[3] Christoph K., Heinz W. K., Jan V.. δ ¹³C and δ ¹⁸O Values of Triassic Brachiopods and Carbonate Rocks as Proxies for Coeval Seawater and Palaeotemperature. Palaeogeography, Palaeoclimatology, Palaeoecology, 2005, 226(3–4): 287-306.

[4] Deng M., Lü J. X., Pan W. L., . Hydrocarbon Preservation Conditions in West Hubei and East Chongqing. Petroleum Geology & Experiment, 2009, 31(2): 202-206.

[5] Guo T. L., Lou Z. H., Ma Y. S.. Several Problems on Oil and Gas Preservation and Their Commercial Prospecting in Marine Sequences of South China. Petroleum Geology & Experiment, 2003, 25(1): 3-9.

[6] Guo Z. F., Yang Z. W., Liu X. M.. Characteristics of Palaeozoic Tectonic Structures and Oil and Gas Prospecting in Jianghan Plain. Marine Origin Petroleum Geology, 2006, 11(2): 9-16.

[7] Hu X. F., Wang S. H., Sheng X. C., . The Characteristics of Water Chemistry and Oil and Gas Preservation in Marine Formation in Middle Yangzi Region. Journal of Oil and Gas Technology, 2007, 29(2): 32-37.

[8] Huang S. J.. A Study on Carbon and Strontium Isotopes of Late Paleozoic Carbonate Rocks in the Upper Yangzi Platform. Acta Geologica Sinica, 1997, 71(1): 45-53.

[9] Huang S. J., Qing H. R., Huang P. P., . The Formation and Evolution of Seawater Strontium Isotopes from Late Permian to Early Triassic—Based on the Research on Carbonate in Zhongliang Mountain, Chongqing. Science in China (Series D), 2008, 12(3): 273-283.

[10] Lou Z. H., Ma Y. S., Guo T. L., . Evalution of Oil and Gas Preservation Conditions in Marine Formation in South China. Natural Gas Industry, 2008, 26(8): 8-12.

[11] McArthur J. M.. Recent Trends in Strontium Isotope Stratigraphy. Terra Nova, 1994, 6: 331-358.

[12] Reinhardt E. G., Blenkinsop J., Patrerson R. T.. Assessment of a Sr Isotope (⁸⁷Sr/⁸⁶Sr) Vital Effect in Marine Taxa from Lee Stocking Island, Bahamas. Geo. Marine Letters, 1998, 18(3): 241-246.

[13] Shi H., Huang S. J., Shen L. C., . Stratigraphical Significance of the Strontium Isotopic Curve of the Upper Paleozoic of Sichuan and Guizhou. Journal of Stratigraphy, 2002, 26(2): 106-110.

[14] Tang L. J., Guo T. L., Tian H. Q., . Poly-Cycle Tectonic Evolution, Differential Deformation and Hydrocarbon Reservation of Central Guizhou and Adjacent Region. Acta Geologica Sinica, 2008, 82(3): 298-307.

[15] Veizer J., Ala D., Azmy K., . ⁸⁷Sr/⁸⁶Sr, δ ¹³C and δ ¹⁸O Evolution of Phanerozoic Seawater. Chemical Geology, 1999, 161(1–3): 59-88.

[16] Wang G. Z., Liu S. G.. Paleo-Fluid Geochemical Evaluation of Hydrocarbon Preservation in Marine Carbonate Rock Areas: Taking Lower Association in Central Sichuan Basin as an Example. Journal of Chegndu University of Technology, 2009, 36(6): 631-644.

[17] Xiao K. H., Chen H., Wo Y. J., . Impact of Tectonic Evolution on Paleozoic and Mesozoic Petroleum Systems in Jianghan Plain. Oil & Gas Geology, 2005, 26(5): 688-693.