ON THE RELATIONSHIP BETWEEN THE OXYGEN AND CARBON ISOTOPES AND THE DIAGENESES OF ORDOVICIAN CARBONATE ROCKS IN THE YANGTAC AREA
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摘要: 本文通过扬子地区奥陶系11个剖面的泥晶灰岩δ18O和伴生泥岩沥青Rmaxo的回归计算拟合结果,表明埋藏古地温主导泥晶灰岩氧同位素交换的现象,并借助这种交换结果,讨论了扬子碳酸盐台地区6个剖面点的奥陶系碳酸盐岩在不同成岩环境下6种成岂作用的氧碳同位素特征,此外,依据这些讨论结果,提出了在评价有机质成熟度、油气的储集和运移方面的地质意义。Abstract: Through the regressional calculation and simulation on the δ18O of micritic limestone and Rmaxo of associated argillous asphaltum from the 11 Ordovician sections in the YangtzeArea,it is suggested that the oxygen isotopic exchanges of the micritic limestones shouldbe dominated by buried paleo-geotemperature, Based on the above analysis,the author ofthis paper discusses on the oxygen and carbon isotopic characteristics of the 6 kinds of diageneses with different diagenetic environments in the Ordovician carbonate rocks of the 6section points of the Yangtze carbonate platform. Furthermore,the author suggests thegeological significance of the discussions in the assessment on the maturity of organic matter and oil/gas accumulation, preservation,and migration.
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[1] 张秀莲.碳酸盐岩中氧、碳德定同位素与古盐度、古水温的关系.沉积学报,1985.3(4),17-30 [2] C. H.小穆尔等,李汉瑜译.碳酸盐岩孔隙地质学.北京:石油工业出版社,1986 [3] 刘德汉等.碳酸盐岩生油岩中沥青变质程度和沥青热变质实验.地球化学,1982,(3):237-243 [4] L. S.兰悠,冯增昭译.白云化作用.北京:石油工业出版社,1985 [5] 刘德汉.碳酸岩中的沥青在研究油气生成演化和金属矿床成因中的应用.有机地球化学论文集,北京:科学出版社.1986 [6] Guo Qiu Gao and Lynton S Land. Early Ordovician Cool Creek dolomite, Middle Arbuckle Group,Slick Hills, SW Oklahoma,U. S. A: Origin and hlodification. Journal of Srdirnentary Petrology, 1991,61(3):161-173 [7] Mountjoy EW and Hadim-Dihardja MK. hlultiple phase fracture and fault-controlled burial dolomitization, Upper Devonian Wabamun Group, Alberta,Journal of Srdimentary petrology, 1991,61(4):590-612 -
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