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东营凹陷利津洼陷古近系沙四段上亚段、沙三段下亚段和沙三段中亚段烃源岩中广泛发育异常高压。对其异常高压的成因进行分析,利用综合解释法建立了研究区80口已钻井的地层孔隙压力系数剖面;明确了沙四段上亚段、沙三段下亚段和沙三段中亚段的地层孔隙压力系数等值线分布,分析了利津洼陷烃源岩地层异常高压的分布特征。研究结果表明,综合解释法在计算由欠压实和生烃膨胀等多种成因共同作用形成的利津洼陷古近系烃源岩异常高压时的精度较高;研究区古近系烃源岩异常高压分布与洼陷形态一致,呈东北—西南向展布,在洼陷深陷区以高压和超高压为主,至洼陷边缘构造高部位逐渐呈辐射状降低至正常压力;洼陷中心的异常高压是烃源岩向洼陷边缘排烃的主要动力。
In the Lijin Sag, Dongying Depression, the Upper Paleogene Shajian Member of the Upper Paleogene of the Dongying Sag, the Lower Member of the third member of Es3, and the Middle Member of the Member of Es3 of the Middle Member have widely developed abnormally high pressures. The causes of its abnormal high pressure are analyzed, and the formation pore pressure coefficient profile of 80 drilled wells in the study area has been established by the comprehensive interpretation method. It has been clarified that the upper sub-section, the lower sub-section of the third sub-section and the middle sub-section of the third sub-section of the Sha-4 Section The distribution of pore pressure coefficient isoline and the distribution characteristics of abnormal high pressure in the source rock of Lijin sub-sag are analyzed. The results show that the comprehensive interpretation method is of high precision in calculating the anomalous high pressure of the Paleogene source rocks in the Lijin Sag formed by the combination of undercompaction and hydrocarbon expansion and so on. The Paleogene source rocks The distribution of anomalous high pressure is consistent with that of a depression, spreading in the northeast-southwest direction, mainly taking the high pressure and the ultra-high pressure in the deep depression of the depression, and decreasing gradually to the normal pressure in the high part of the margin structure of the depression; the center of the depression The abnormal high pressure is the main source of hydrocarbons expelled from the source rock to the margin of the depression.