摘要:
鄂尔多斯盆地延长组长 6储层中广泛分布浊沸石胶结物,包体测温结果表明其形成温度在 6 0～ 70℃之间,主要形成于早成岩阶段B期。浊沸石形成以后,有机质脱羧作用形成的有机酸对其溶蚀,并形成大量次生孔隙。勘探结果证实延长统找到的油藏大部分都聚集在这些浊沸石次生孔隙中。因此,关于浊沸石胶结物的形成机理及分布规律研究对延长组油气藏的成藏机理,以及油气富集规律研究非常重要。本文从沉积微相研究入手,通过野外露头、岩心及铸体薄片、包裹体测温、扫描电镜、电子探针等分析,研究浊沸石的形成机理、分布规律以及与沉积微相的关系,从而达到通过沉积微相的展布特征来预测浊沸石分布规律。最后通过研究浊沸石次生孔隙的发育特征,预测油气藏的分布。
Abstract:
Laumonti te cement is mainly distributed in the Yanchang 6 reservoir of the no rtheast Ordos basin.Through measuring inclusions in laumontite, we know that its is forming temperature is between 60 ℃and 70 ℃ and it formed in the B period of early diagenetic stage.How ever, in the A period of later diagenetic stage, laumontite were dissolved by organic acid which was generated in decarboxylation of kerogen, and a great quantity of secondary pores were formed.Exploration results have proved that newly found reservoirs are largely dist ributed in the laumontite secondary pore zone.Thus, the formation process and distribution of laumontite cement are very important for exploring reservoirs and hydrocarbon accumulat ion.In the paper, with the investigations of outcrop,thin section, organic inclusion, scanning elect ronmicroscope and elect ron microprobe, the relationship of the forming process, distribution of laumontite cement and sedimentary microfacies is studied on the basis of sedimentary microfacies.The purpose is that laumontite distribution is predicted by sedimentary microfacies.As a result, reservoir distribution is predicted.
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