盆地埋藏火山机构的地质-地球物理二维精细解剖——以松南腰英台地区营城组一段为例

腰英台地区营城组一段火山岩气藏为火山机构内幕型气藏,其储层分布受火山机构控制.本文以旋回作为时间格架进行火山机构的精细划分.首先通过钻井火山岩岩性、岩相、测井资料识别出的旋回间风化壳和沉积岩夹层等地质界面,地震剖面上全区发育的连续强反射同相轴等划分火山岩的旋回.然后,在旋回内部根据不同钻井岩性、岩相的变化以及火山机构的...

The geological-geophysical two-dimensional dissection of basin buried volcanic edifices——Take the first member of Yingcheng Formation in Yaoyingtai region of southern Songliao Basin as an example

The volcanic gas reservoirs of the First Member of the Yingcheng Formation are controlled by volcanic edifices insider in Yaoyingtai area. In this paper, we take the cycles as the time-framework for the fine dividing of the volcanic edifices. First, we can divide the cycles using lithology and lithofacies in the well, the geological surfaces like weathering crust, sedimentary interbed and so on by logging method, and the continuous strong reflection on seismic sections of seismic events which can be traced in the whole region. Second, we can identify the volcanic edifices in the cycles by the differences of lithology and lithofacies in different wells, and the seismic phase characteristics of the volcanic edifices, and divide the boundary of the adjacent volcanic edifices by the unconformable intersection or angle contrary of the seismic events. Last, in the volcanic edifices, we can divide the stages via the facies sequence in wells, the weathering crust, baking border, chilled border, alteration zone identified by logging, and the basically continuous strong reflection of seismic events in the volcanic edifices. Using the geology-geophysical methods synthetically, the volcanic rocks can be divided into four cycles, eight volcanic edifices and twenty-six stages in Yaoyingtai area. Take the stages as the minimum unit for controlling lithofacies and the reservoir spatial distribution characteristics which can be identified by seismic data. Combined with the seismic facies, the drilling lithofacies and reservoir characteristics, we can dissect the volcanic edifices step by step, including lithofacies and reservoir inside the volcanic edifices. Dividing the volcanic edifices in cycles framework and researching insider lithofacies and reservoir characteristics in the unit of stages has reference value for finding favorable reservoir and guiding the horizontal well drilling which need to drill along the reservoirs.