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应用地震解释成果和钻井资料,研究了统5井区的微构造分布特征和不同构造部位储层物性和流体分布特征,明确指明有效储层发育的构造部位和天然气富集的有利构造部位。认为统5井区马五1～4亚段的圈闭类型是地层-古沟槽-鼻状构造复合圈闭。这类复合圈闭的储集层、盖层、古沟槽与构造配置合理,它不仅圈闭奥陶系本身油型气,而且最主要是通过古沟槽捕获上覆石炭-二叠系的煤成气。此外,中生代时石炭-二叠系的中含烃酸性流体通过古沟槽,对其附近形成风化壳岩体进行再溶蚀,使孔、洞、缝更发育,储集性能大大提高。
Based on the seismic interpretation results and drilling data, the microstructural distribution features and the reservoir physical properties and fluid distribution features in different tectonic parts are studied. The tectonic parts of effective reservoirs and the favorable structural parts enriched in natural gas are clearly indicated. It is considered that the trap type of the Ma5-1 ~ 4 sub-sections in the Tong 5 well area is a compound traps of strata-paleo-groove-nose structure. The reservoirs, caprocks and ancient troughs of these composite traps are reasonable and structurally configured. They not only trap the oil gas of the Ordovician itself, but also capture the overlying Carboniferous-Permian Coal into the gas. In addition, during the Mesozoic, the hydrocarbon-bearing acidic fluids in the Permo-Permian pass through the ancient trenches to re-dissolve the weathered crust rocks in the vicinity of them to make pores, holes and seams more developed and reservoir performance greatly enhanced.