The Rift Basins Of Organic Maturation History Modeling In The Jianghan Basin

The heat system of the basin depends on the deep heat of the bottom of the basin,including the radioactivity heat and the heat form the deep mantle heat source. Thecrust and upper mantle of the rift basin are thinning greatly and the radioactivity canbe ignored. The paper explains the formulae of the bottom heat flow of the rift basinand the influence the multi-rift basin throw to the heat system. Then explain thearithmetic and calculation workflow of the ancient ground temperature and the matureof organic matter . The paper simulates the history of the subsidence and embedding and the matureof organics of jianghan basin. Jianghan basin is a K-E rift basin and contains jianglinghollow, qianjiang hollow,xianban hollow, mianyang hollow and so on . it mainlysimulates the the history of the subsidence and the mature of organic matter of themain hollow in jianghan basin and analyzes the mature of organic matter ofhydrocarbon source rock in xingouzui(Ex) and qianjiang(Eq), then find theevolvement stage of the organic matter. Via simulation result, the paper concludes: thehydrocarbon source rock in qianjiang group in qianbei hollow begins to evolve to oilat qianjiang stage, reach the peak at jinghezheng stage, the hydrocarbon source rockin xingouzui group in qianbei hollow begin to evolve to oil in jinghe stage and reachthe peak in qianjiang early stage then end in late qiangjiang stage. the hydrocarbonsource rock in Xingouzui group in chentuokou and mianyang hollow begins to evolveto oil until the middle qianqiang stage, and the simulated Ro falls between 0.5 and 0.7,the Ro can reach 0.7 in the subsidence center. the hydrocarbon source rock inXingouzui group in xiaoban hollow begins to evolves to oil in late jinghezheng stageand reach the peak in middle qianjiang stage(the simulated Ro falls between 0.8 and0.9).After comparison of the simulation result with history research result, I findthey are consistent with each other, and it demonstrates the mature of organic mattersimulation module of the rift basin simulation system is a reliable software to researchthe evolution of the mature of the organic matter for rift basin.