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以松辽盆地南部为研究区,基于物质平衡法对源岩的排烃强度进行定量评价,利用PetroMod软件的超压模块对源岩内超压进行评价。通过建立源岩排烃强度与残余有机碳含量及超压的关系,根据拐点确定出岩石排烃量2 mg/g、残余有机碳含量0.8%、超压1 MPa为致密油源岩的下限,提出岩石排烃量8 mg/g、残余有机碳含量2.0%、超压7 MPa为致密油优质源岩的界限。据此,将致密油源岩划分为优质源岩(Ⅰ类)、低效源岩(Ⅱ类)、无效源岩(Ⅲ类)。利用致密油源岩的下限及分级评价标准对松辽盆地南部致密油有利区分布范围进行评价,结果显示优质源岩对致密油分布具有显著的控制作用,优质源岩发育区及邻近层位是致密油富集的有利区。图8表2参52
Taking the southern part of Songliao Basin as the research area, the hydrocarbon expulsion intensity of source rock was quantitatively evaluated based on material balance method. Overpressure of source rock was evaluated by overpressure module of PetroMod software. Based on the inflection point, the hydrocarbon expulsion amount 2 mg / g, residual organic carbon 0.8% and overpressure 1 MPa are the lower limits of tight oil source rocks. The relationship between hydrocarbon expulsion intensity and residual organic carbon content and overpressure is established. The hydrocarbon expulsion rate of 8 mg / g, residual organic carbon content of 2.0% and overpressure of 7 MPa are the boundaries of the tight source oil of good quality. Therefore, the tight oil source rocks are divided into high quality source rocks (Ⅰ), low-efficiency source rocks (Ⅱ) and ineffective source rocks (Ⅲ). Using the lower limit and grading criteria of tight source rock to evaluate the distribution of the tight oil in the southern Songliao Basin, the results show that the high-quality source rocks have a significant control over tight oil distribution. The development of high-quality source rock and its adjacent horizon are Dense oil enrichment of the favorable area. Figure 8 Table 2 reference 52