Reservoir Organic Geochemical Description-An Example from Carboniferous Reserviors on the Tazhong 4 Structure in the Tarim Basin
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摘要: 运用棒色谱ＴＬＣ－ＦＩＤ和油显示仪ＯＳＡ对塔中四号构造ＴＺ４、ＴＺ４０２及ＴＺ４０１井石炭系岩芯进行密集采样分析（约３个/ｍ），并选择典型原油进行ＧＣ、ＧＣ/ＭＳ和碳同位素分析。研究表明，石炭系储层油族组成在横向和纵向上都存在明显的非均质性；纵向上可分为三段：CⅢ1（油层段）；CⅢ2CⅢ3（油水同层段），CⅢ2CⅢ3中局部含油率较高的层段可能有试油价值。推测原始油藏可能受喜山阶段的构造运动破坏，CⅢ3油气发生过自西向东的再分配，CⅢ2油气则沿断层向上溢出，形成现今具两期古油水界面的油水系统格局。据横向上存在的成熟度差异，推测来自下古生界的主力油源注入方向可能是由北西向南东；但色谱和碳同位素等资料反映TZ401井所在的１号高点可能有另一次要的源自上古生界的原油混入。Abstract: Using the thin layer chromatoraphy /flame ioniertion detector( TLC-FID) coupled with the oil showanaly zer(OSA),the Carboniferous cores from three wells on the Tazhong 4 structure were densely cal-lected and analy sed(about 3 /m),while typical oil samples selected were analysed by GC GC/MS and cardonisotope analysis. The study indicated that thegross composition of residual oils exists an obviousheterogeneities either vertically or laterally. The C group can be divided into three layers CⅢ1(oillay er)CⅢ2,CⅢ3(oil-water lay ers)·It was considered that local layers with high oil saturation within CⅢ2,CⅢ3 are of value to test oil and that the primary petroleum reservoir could be destroyed by the Himalayanmovement and petroleum of CⅢ3 was redistributed again from west to east. then the petroleum of CⅢ2flowed out along the fault and the oil-water system which has two palaeo-oil-water contacts was formed.According to the lateral maturity variation, it was considered that the filling direction of the main oilsource from the Lower Palaeo zoi c is tentatively from west-north to east-sorth. But data of chromatographic analysis and the valueof carbon isotopes of oils suggested that another type of oil from asubsidiarysou rcein the Upper Palaeozoic fill in the structural high 1on the TZ4 stmcture.
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