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随着渤海地区勘探程度日趋成熟,位于渤海海域南部的渤南矿区在贯彻以寻找大中型油气田为目标的同时,兼顾在成熟油田周边寻找滚动目标的勘探.滚动目标主要以浅层的构造加岩性目标为主,目标层段主要分布在明上段和明下段,其中明上段的河流-平原相为砂泥岩互层,明下段的平原-河流相为泥岩夹砂岩,储层厚度横向变化快.目前地震上的砂体厚度预测在极限分辨率内,即超过四分之一地震波长的砂体厚度预测不准确.本文首先从经典的楔状模型出发,通过正演得出砂体厚度与峰值频率的相关规律.进而以成熟油田的丰富井资料为基础,基于多口生产井的统计,研究峰值频率和砂体不同厚度间的关系,从而拟合出适合目标区的线性关系式.研究表明当储层含纯油层时会降低砂体的峰值频率,而含水时会提高砂体的峰值频率,因此在经验公式拟合时需要对井点按流体进行分类.在成熟油田周边寻找滚动目标,可以在同等地质条件下拟合一个经验公式,从而实现目标区的厚度预测.
With the exploration in Bohai area becoming more and more mature, the Bo’nan mining area in the southern Bohai Sea area is pursuing the goal of finding large and medium-sized oil and gas fields, taking into consideration the prospecting of rolling targets in the periphery of mature oilfields.The rolling targets are mainly shallow structures The target intervals are mainly located in the upper part of Ming and the lower part of Ming. The river-plains facies in the upper part of Ming Ming are interbedded with sand-mudstone. The plains-fluvial facies in the lower part of Ming-Ming are mudstone-sandstone with rapid lateral thickness changes. At present, the prediction of sand body thickness on earthquakes is inaccurately predicted in the limit resolution, ie the thickness of sand body over one quarter of the seismic wavelength is not accurate.In this paper, starting from the classic wedge model, the sand body thickness and peak frequency Then based on the data of rich wells in mature oilfield, the relationship between the peak frequency and different thickness of sand body is studied based on the statistics of multi-well production wells to fit the linear relationship suitable for the target area.Research shows that when Reservoirs containing pure oil will reduce the peak frequency of the sand body, and water will increase the peak frequency of the sand body, so the empirical formula fitting need to press the well point fluid Categorize. Looking at the surrounding rolling target mature fields, can fit an empirical formula in the same geological conditions, in order to achieve the predicted target zone thickness.