二连盆地隐蔽油气藏成藏模式及预测研究
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摘要
二连盆地是在内蒙古-大兴安岭海西褶皱带基底上发育起来的中生代断陷盆地,盆
    地内的马尼特坳陷、乌尼特坳陷、腾格尔坳陷、乌兰察布坳陷和川井坳陷是由下白垩统
    巴彦花群生油、含油层系为主体沉积的一群中小规模的断陷型凹陷组合而成。每一个凹
    陷都有各自独立的沉积体系,是一个相对独立的烃类生成、运移和聚集基本单元。
    本论文通过对二连盆地隐蔽油气藏形成的地质条件和油气运移聚集特征研究,建立
    了各类隐蔽油藏的成藏模式,提出了隐蔽油气藏的勘探研究思路和识别预测技术方法。
    通过研究取得以下认识和成果:二连盆地白垩系发育的两套主力烃源层是其形成的资源
    基础,凸凹相间的凹陷结构提供了沉积构造背景,多物源、近物源、窄相带的沉积砂体
    易于隐蔽圈闭形成。按照圈闭成因,将隐蔽油气藏划分为岩性油气藏、地层油气藏、复
    合油气藏;二连盆地隐蔽油气藏的分布和富集受单一型温-压系统控制,主要沿湖泛面、
    不整合面、断面分布,平面上受控于沉积体系的空间展布,纵向上赋存于原生或次生孔
    隙发育带。根据凹陷结构及发育特点,建立了凹陷陡坡带、洼槽带和缓坡带的隐蔽油气
    藏模式,对不同储集类型的典型油气藏进行了识别和预测研究,并针对隐蔽油气藏的预
    测难点,系统总结出了适用于二连盆地隐蔽油气藏的研究方法技术,用于指导隐蔽油气
    藏的勘探实践。
The Erlian Basin is a Mesozoic rift-subsidence basin developed on the basis of Inner-Mongolia and Daxinganling Hercynian fold belt. The basin consists of a series of rift-subsidence depressions including Manite, Wunite, Tengge'er, Wulanchabu and Chuanjing. The source beds and oil horizons of these depressions belong to lower Cretaceous. Each depression, with independent depositional systems, is relatively independent for hydrocarbon formation, migration and accumulation. Based on the studies on geologic conditions, migration and accumulation for subtle traps in The Erlian Basin, the accumulation pattern of different subtle traps is established, then study methods and prediction techniques forexploration of subtle traps were put forward.The main knowledge and conclusions are as follows. The depressions are abundant resources provided by two sets of source beds of Cretaceous with favorable structure background of interchanged uplifts and sags, and great amounts of sand bodies formed under special sedimentation conditions of multi-sources, near-sources and narrow-sedimentary face belts. According to origination of traps, subtle oil reservoirs in Erlian basin can be divided into lithologic, stratigraphic and multiple three types. Most of the subtle oil reservoirs are under a uniform temperature and pressure system. They mainly developed along the maximum lacustrine flood surfaces, unconformity planes and fault planes. In space distribution, they are mainly controlled by sedimentation systems in horizontal and concentrated in primary or secondary pore developing belts in vertical. Different sags have different structural features and thus can form different types of subtle oil reservoirs.Three kinds of oil accumulation patterns of subtle traps, including steep slope, slow slope and trough belts, are established in this paper. Different kinds of typical subtle oil reservoirs are identified and predicted. And also research methods and techniques for subtle oil reservoir suitable in the Erlian basin are put forward.
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