银额盆地哈日凹陷巴音戈壁组流体包裹体特征与油气成藏期次

doi:10.3969/j.issn.1672-7703.2019.06.003

摘要/Abstract

摘要： 前人对银额盆地中生界油气成藏期次和时间的认识存在很大分歧，造成这种分歧的可能原因是复杂的地质条件及其所引起的盆地内不同凹陷、甚至是同一凹陷不同构造部位油气成藏时间存在差异性，而前人的研究仅基于有限的样品点，研究结论不能有效指导勘探。以哈日凹陷为研究对象，对不同构造部位钻井的主要含油层段（巴音戈壁组）进行针对性取样，对样品开展流体包裹体相关研究，发现所有样品均存在大量的流体包裹体，包裹体的类别主要有烃包裹体和盐水包裹体。其中油包裹体的荧光颜色有淡蓝色和淡黄色两种，其荧光光谱特征也指示研究区至少存在两期不同成熟度的烃类充注过程。对取样井进行沉积埋藏史和热演化史数值模拟，结合与烃包裹体共生盐水包裹体的均一温度，确定了油气成藏期次和时间。洼漕带YHC1 井巴音戈壁组存在两期油气充注，时间分别为107—104Ma 和99Ma，对应苏红图组沉积中期和银根组沉积早期；斜坡带H3 井也存在两期油气充注，时间分别为99Ma 和72— 71Ma，对应银根组沉积早期和乌兰苏海组沉积晚期；边缘带的H2 井也存在两期油气充注，时间分别为85Ma 和 75—71Ma，对应乌兰苏海组沉积中期和晚期。凹陷不同构造部位油气成藏时间的差异表明研究区巴音戈壁组烃源岩所生成的油气二次运移距离极为有限，油藏以近源成藏为主。

关键词: 流体包裹体, 油气成藏期次, 巴音戈壁组, 哈日凹陷, 银额盆地

Abstract: Predecessors have great differences in the understanding of the hydrocarbon accumulation period and time in the Mesozoic in the Yingen-Ejinaqi Basin. Possible causes for these differences are complex geological conditions and different accumulation times in different sags and even in different structural parts of the same sag in the basin. In addition, previous studies are only based on limited samples, so the research conclusions cannot effectively guide exploration. Taking the Hari sag as the research object, samples were taken from the primary oil- bearing intervals (Bayingebi Formation) in different structural parts, and analyzed on ?uid inclusions. All of the samples contain a large number of ?uid inclusions, and the inclusions are hydrocarbon inclusions and brine inclusions. The ?uorescence of the oil inclusions is light blue and light yellow, and the ?uorescence spectral characteristics indicate that there are at least two hydrocarbon ?lling periods with different maturities in the study area. Numerical stimulation to the sedimentary, burial and thermal evolution history of the sampled wells determined the period and time of hydrocarbon accumulation by considering the homogeneous temperature of the brine inclusions coexisting with the hydrocarbon inclusions. In the Bayingebi Formation in Well YHC1drilled in a subsag, two periods of hydrocarbon ?lling occurred at 107104 Ma and 99 Ma, corresponding to the middle deposition of the Suhongtu Formation and the early deposition of the Yingen Formation. In Well H3 in a slope zone, two periods of hydrocarbon ?lling took place at 99 Ma and 7271 Ma, corresponding to the early deposition of the Yingen Formation and the late deposition of the Wulansuhai Formation. In Well H2, in a marginal zone, two periods of hydrocarbon ?lling took place at 85 Ma and 7571 Ma, corresponding to the middle and late deposition of the Wulansuhai Formation. The difference in hydrocarbon accumulation periods in different structural parts of the Hari sag indicates that the secondary migration distance of hydrocarbons generated by the source rocks of the Bayingebi Formation in the study area is extremely limited, and near-source accumulation is dominant.

中图分类号:

任来义, 贺永红, 陈治军, 刘护创, 白晓寅, 王小多, 韩长春. 银额盆地哈日凹陷巴音戈壁组流体包裹体特征与油气成藏期次[J]. 中国石油勘探, 2019, 24(6): 709-720.

Ren Laiyi, He Yonghong, Chen Zhijun, Liu Huchuang, Bai Xiaoyin, Wang Xiaoduo, Han Changchun. Fluid inclusion characteristics and hydrocarbon accumulation periods of the Bayingebi Formation in Hari sag, Yingen-Ejinaqi Basin[J]. China Petroleum Exploration, 2019, 24(6): 709-720.

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