The Numeric Modeling Of Reservoir－Forming History Of Palaeozoic At Wenan Slope In The Bohaiwan Basin

By comprehensively applying the data of logging, drilling and seismic data, and depending on basin-modeling technology, and synchronously, integrating fluid inclusion homogenization, Raman spectrum ingredient assay and autogeny illite Age-determining technique, we had the numeric modeling of Carboniferous-Permian coal measure, including burial history, terrestrial heat history, hydrocarbon-generating and hydrocarbon-expulsing history and reservoir-forming history, at the Wenan Slope of Jizhong Depression, in the Bohaiwan Basin.Through research, The organic matter of source rocks in Carboniferous-Permian coal measure strata began first hydrocarbon-generating in mesozoic, and the first hydrocarbon-filling took place. But, because of Yanshan movement later, the Carboniferous-Permian strata rose, as a result, the first hydrocarbon-generating and reservoir-forming paused; In early Tertiary period, because Carboniferous-Permian strata dipping forward east originally turned into dipping forward west, the prototype of faulted block began to form gradually; By the end of Sha-3 period of early Tertiary, the paleogeotherm of Carboniferous-Permian strata exceed the Mesozoic's temperature again, and accordingly, abundant hydrocarbon was generated and expulsed secondly. The trap continued to develop; from the end of late Tertiary to Quaternary, the second hydrocarbon-generating and expulsing got to its peak, and the second reservoir-forming was over. In the period of Sha-3 Formation, Volcanic cocks invaded into Carboniferous-Permian strata in a large scale, which can bring positive effect on hydrocarbon generating and reservoir-forming. Through modeling and calculation, we have figured out that contribution to hydrocarbon-generating caused by volcanic rocks' invasion is 62.4 percent.In my article, we first have made a conclusion by reservoir-forming chronology that the forming-age of reservoir is 108.27 ?.57Ma, of which, the source rock came from Carboniferous-Permian strata; We have perfected our Basin-modeling software, so it can calculate quantificationally the contribution radio to hydrocarbon-generating caused by igneous intrusion as a technical problem, in which we have a daring trail.