威利斯顿盆地和西墨西哥湾盆地致密油成藏差异

发布时间：2018-04-24 19:09

本文选题：威利斯顿盆地 + 巴肯组　；参考：《新疆石油地质》2016年06期

【摘要】：在分析油气勘探相关资料的基础上,结合薄片鉴定和有机地球化学资料,探讨了威利斯顿盆地巴肯组和西墨西哥湾盆地鹰滩组泥页岩地质、地球化学特征,并剖析了巴肯组和鹰滩组油气成藏差异的原因。巴肯组和鹰滩组岩石组合的不同导致二者油气成藏方式存在差异,巴肯组以源外成藏为主,鹰滩组以源内成藏为主。巴肯组泥页岩生烃产生的超压大于鹰滩组,具有更大的排烃动力,有利于油气从泥页岩中排出,从而导致巴肯组泥页岩中滞留的油气较少,而鹰滩组泥页岩生成的油气大部分滞留在泥页岩内部。巴肯组中段物性优于上段和下段,而且连通孔隙更发育,孔喉更大,为油气主要赋存的层段;而鹰滩组泥页岩和灰岩中孔隙都较发育,这2类储集层都对烃类的储存有重要的贡献。巴肯组致密油藏和鹰滩组致密油藏均为连续型或准连续型油藏,巴肯组致密油藏主要以纵向运移为主,巴肯组中段致密储集层形成了大面积连续分布的致密油区,而鹰滩组致密油藏同时存在纵向运移和侧向运移,形成了纵向上泥页岩油藏和致密灰岩油藏互相叠置,具有源储一体、叠加连片的特点。
[Abstract]:On the basis of analyzing the related data of oil and gas exploration, combined with thin slice identification and organic geochemical data, the shale geology and geochemistry characteristics of the Bakon formation in the Williston Basin and the Yingtan formation in the western Gulf of Mexico basin are discussed. The reasons of oil and gas accumulation difference between Baken formation and Yingtan formation are analyzed. The difference of rock assemblages between the Baken formation and the Yingtan formation leads to the difference of hydrocarbon accumulation patterns between the two formations. The Bain formation is mainly formed outside the source and the Yingtan formation is mainly formed within the source. The hydrocarbon-generating pressure of the shale in the Baken formation is larger than that in the Yingtan formation, which has a greater hydrocarbon expulsion power, which is beneficial to the expulsion of oil and gas from the shale, resulting in less oil and gas remaining in the shale of the Baken formation. However, most of the oil and gas generated by shale of Yingtan formation remain inside the shale. The physical properties of the middle member of the Baken formation are superior to those of the upper and lower segments, and the connected pores are more developed, the pore throat is larger, and the reservoir is the main reservoir of oil and gas, while the pores in the shale and limestone of the Yingtan formation are more developed. Both types of reservoirs contribute significantly to hydrocarbon storage. The dense reservoirs of Baken formation and Yingtan formation are both continuous or quasi-continuous reservoirs, and the dense reservoirs of Baken formation are mainly vertical migration. The dense reservoirs in the middle part of the Baken formation form a large area of continuous dense oil areas. However, both vertical and lateral migration exist in the dense reservoir of Yingtan formation, which results in the superposition of the shale reservoir and the dense limestone reservoir, which has the characteristics of source storage and stacking and lamination.
【作者单位】：中国石油大学非常规油气与新能源研究院;中国石油大学地球科学与技术学院;中国石油集团测井有限公司长庆事业部;
【基金】：国家自然科学基金(41402122) 博士后科学基金(2014M561980)
【分类号】：P618.13

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