盆地模拟及在松南地区的应用

Basin modeling and its application in the south part of Songliao Basin

松南地区盆地模拟主要包括了构造演化史、埋藏史、热史、生排烃史和油气运聚史的模拟。利用本模拟系统对松南地区十屋、德惠、伏龙泉和柳条断陷的油气资源量及资源结构特征进行了计算和研究。松南地区区域主力烃源岩为沙河子组 ,次要烃源岩为火石岭组和营城组。区域内 4个主要断陷盆地中 ,德惠断陷生烃量最大为 6 2 8× 10 8 t,其次为十屋断陷 2 39.0 8× 10 8 t。烃源岩演化程度最高为十屋断陷 ,生油气比为 1∶17,柳条断陷演化程度最低 ,生油气比为 1.2∶1。区内具有工业价值油气区的总体模拟特征为生烃强度大于 4 0× 10 4 t/km2 ,排烃强度大于 2 0× 10 4 t/km2 的区域之内 ,运移指向聚敛特征明显 ,运移强度较大。

The basin modeling in the south part of Songliao Basin mainly consists of simulations of structural evolution history, burial history, hydrocarbon generating and hydrocarbon expelling history, and hydrocarbon migration and accumulation history. Investigations on the amount of hydrocarbon resources and the resource structure were performed in the fault depressions of Shiwu, Dehui, Fulongquan, and Liutiao in the area. The main hydrocarbon source rock in the south part of Songliao Basin is Shahe Formation, the secondary hydrocarbon source rocks are formations of Huoshiling and Yingcheng. The Dehui Fault Depression possesses the highest hydrocarbon generating amount (628×10 8 t) in the four fault depressions, and the Shiwu Fault Depression the second (239.08×10 8 t). The highest evolution degree of hydrocarbon source rock is in Shiwu Fault Depression with oil to gas of 1∶17, the Liutiao Fault Depression the lowest with oil to gas of 1.2∶1. It can be seen from the modeling that the intensity of hydrocarbon generation is greater than 40×10 4 t/km 2 , and the intensity of hydrocarbon expulsion is more than 20×10 4 t/km 2 in areas with commercial hydrocarbon accumulations. The area exhibits clear directional migration convergence and relatively strong migration intensity.