南羌塘坳陷布曲组油藏带特征及空间演化规律

发布时间：2018-03-02 07:26

本文关键词： 油藏带空间展布沉积特征布曲组南羌塘坳陷　出处：《岩性油气藏》2017年01期 　论文类型：期刊论文

【摘要】：南羌塘坳陷大面积出露中侏罗统布曲组油藏带,为了了解布曲组油层地下隐伏特征,查明油气富集规律,根据油藏带地质产状、发育层位、沉积序列及空间分布等特征,结合油藏带形成时的古地理格架,研究了油藏带的形成与演化过程。结果表明,油藏带平面上集中分布于隆鄂尼、昂达尔错和赛仁等3个区块,并以东西向稳定线状展布为特征,成层性好;油层内部可见大量礁滩相残余构造,常与介壳灰岩、生物碎屑灰岩、鲕粒灰岩及砂屑灰岩相伴生,显示出典型台地边缘礁滩相沉积特征,其形成与演化受沉积相带和海平面升降变化的控制:在布曲组沉积早期,台缘浅滩位于南羌塘坳陷南缘塞仁—昂罢存咚一带;随着海平面的上升,沉积相带发生退积,向北依次形成晓嘎晓那—日尕尔保、扎仁—冬浪啪和日阿梗—噢纵等一系列线状分布的台地边缘相沉积;在布曲组沉积晚期,由于海平面下降,台地边缘礁滩相沉积向南进积扩展,形成隆鄂尼区块上部礁滩相沉积。
[Abstract]:In order to understand the underground hidden characteristics of Buqu formation and find out the regularity of oil and gas enrichment, according to the geological occurrence, developmental horizon, sedimentary sequence and spatial distribution of the reservoir zone, the Buqu formation reservoir belt in South Qiangtang depression is of the Middle Jurassic Jurassic in the large area, in order to understand the underground hidden characteristics of the formation, and to find out the regularity of oil and gas enrichment. Combined with the paleogeographic framework of the formation of the reservoir belt, the formation and evolution process of the reservoir belt is studied. The results show that the reservoir belt is distributed in three blocks, namely Longni, Ondaro and Sairen. It is characterized by stable linear distribution in the east-west direction and good stratification. A large number of residual structures of reef and beach facies are found in the reservoir, often associated with meso-shell limestone, bioclastic limestone, oolitic limestone and sand limestone. It shows that the formation and evolution of typical platform margin reef beach facies are controlled by sedimentary facies zone and sea level fluctuation: in the early sedimentary period of Buqu formation, the platform shoal was located in the southern margin of Qiangtang depression. With the rise of sea level, the sedimentary facies belt retrogradation occurred, forming a series of linear distributional platform marginal facies, such as Xiaogaonia-Raigarbao, Zahren-Donglangping and Raiya Longitudinal, to the north, and in the late period of the Buqu formation, As a result of the sea level drop, the reef beach facies in the platform margin extend southward, forming the upper reef beach facies deposit in Longni block.
【作者单位】：成都理工大学沉积地质研究院;油气藏地质及开发工程国家重点实验室(成都理工大学);中国地质科学院;
【基金】：国土资源部沉积盆地与油气资源重点实验室开放基金“羌塘盆地南部隆鄂尼—昂达尔错地区油源对比及油气富集规律研究”(编号:zdsys2014002) 油气藏地质及开发工程国家重点实验室(成都理工大学)开放基金“南羌塘盆地有效烃源岩综合评价”(编号:PLC201603)联合资助
【分类号】：P618.13

【参考文献】