腰坪地区延长组油藏分布规律及主控因素

Distribution and Main Control Factors of Oil Reservoir in the Yanchang Formation in the Yaoping Region, Erdos Basin

在前人研究基础上,对鄂尔多斯盆地腰坪地区地区延长组油藏分布规律及成藏主控因素进行研究表明,该区延长组油藏为典型的岩性油藏,油气主要富集在有利相带的主砂体发育部位,以岩性上倾尖灭油藏或透镜状砂岩油藏为主,在单斜构造的鼻状隆起部位,容易形成构造岩性油藏,油藏具有连通性差,非均质性强等特点。油藏平面上主要分布在浊积水道砂体中,纵向上油藏主要分布在长6-2、长6-3油层组,其次是长7油层组,油藏的形成和富集主要受油源条件、沉积微相和储层物性变化、鼻状隆起构造等几个方面的因素控制。

The present paper has a discussion on distribution of oil reservoir and main control factors oil accumulation in the Yanchang Formation in the Yaoping region, Erdos basin. The study indicates that the oil reservoir is typical lithologic oil reservoir. Oil and gas accumulates in major sand bodies of favorable sedimentary facies, forming updip pinching out reservoir or lenticular sandstone reservoir in nose-like uplift of monoclinal structure of turbidite channel sand bodies of the Chang 6-2, 6-3 and 7 oil bearing sand formation. The Formation of oil reservoir was controlled by hydrocarbon source, sedimentary microfacies, physical property of reservoir and structure.