CFD油田火山岩展布特征及其对油藏的控制作用

火山岩复合油气藏特征独特,为揭示该类油气藏的特征和拓展勘探思路,论述了火山岩的特征及其对油藏的控制作用.综合薄片、钻井、测井和地震资料研究火山岩的岩相特征和发育模式,采用岩电分析和测井响应特征研究手段定量识别玄武岩和凝灰岩.在此基础上,依据地球物理手段确定火山岩和砂泥岩的波阻抗界限值,并基于测井约束下的波阻抗反演和东营...

Distribution Characteristics of Volcanic Rock in CFD Oilfield and Its Controlling Effect on Reservoir

The characteristics of volcanic complex reservoirs are unique. In order to reveal the characteristics of these reservoirs and expand the exploration ideas, this paper discusses the characteristics of volcanic rocks and their control on the reservoirs. The lithofacies characteristics and development patterns of volcanic rocks were studied by combining thin section, drilling, logging and seismic data. In addition, basalt and tuff were identified quantitatively by means of rock electrical analysis and logging response characteristics. Based on this, the boundary limits of wave impedance of volcanic rock and sand-mudstone are determined by geophysical method, and the seismic characteristics of wave impedance inversion under logging constraints and disorderly reflection in local well area of Dong Ying Formation are used to describe and predict volcanic rock distribution under complex lithological background. Guan Tao Formation is a large-scale volcanic activity period which contributes to development of a large set of volcanic rock, mainly distributing in the south and southwest of the oil field. The slightly activity of the Volcanoes of Dong Ying and Sha He Jie Groups results in a small amount of volcanic rock developed, which is scattered in the local well area of oil field. The closer to main faulted area, the thicker volcanic rocks are, so it can be inferred that development and distribution of volcanic rocks controlled by main faults. Volcanic rock is tight, which can serve as reservoir cap rock and lateral sealing layer, occupying the sedimentary space of exotic clastic rocks. Volcanic rock is a necessary condition for oil and gas accumulation in the study area, but it will segment trap, control and restrict the distribution of clastic rock, limit the type and scale of reservoir, as well as have certain effect on the crude oil property. The research results reveal a new exploration area of Cenozoic in Bohai Bay Basin, which can also provide an example for reservoir evaluation and development deployment.