松辽盆地北部扶余油层致密油资源评价

RESOURCES EVALUATIONS OF THE TIGHT OIL IN FUYU RESERVOIRS OF NORTH SONGLIAO BASIN

致密油已成为松辽盆地重要的接替资源。为搞清致密油资源潜力、资源分布,有效指导致密油勘探,对扶余油层致密油进行了资源评价。根据研究区致密油的勘探程度,应用分级资源丰度类比法和小面元容积法,在地质特征和成藏条件研究基础上,依据储层物性和含油性对评价区进行分级,开展扶余油层致密油资源量计算。结果表明:扶余油层致密油地质资源量为10.5×10~8~11.15×10~8t,其中以I类资源为主,Ⅰ类资源量约为Ⅱ类资源量的2倍;资源量分布由大到小依次为三肇凹陷、大庆长垣、龙虎泡阶地、古龙凹陷、朝阳沟背斜和齐家凹陷,其中三肇凹陷资源量占致密油总资源量31%以上,大庆长垣占总资源量27%。研究指出三肇凹陷和大庆长垣不但致密油资源丰富而且资源品质较好,是下一步重点勘探区域。

Tight oils have become important succeeding resources in Songliao Basin. In order to make sure of the resources potentials and distributions,and moreover effectively guide the tight oil exploration,the resources evaluations were conducted for the tight oil in Fuyu reservoirs. According to the explored degrees of the tight oil in the study areas,with the help of graded-resource-abundance analogy method and cell-based / small-bin volume method,on the bases of the geological characteristics and reservoir petroleum accumulating conditions,the classifications were performed for the evaluating units in the light of the reservoir physical properties and oil-bearing property / oil contents,and furthermore the resources were calculated for Fuyu tight oil. The achievements show that the geological resources of the tight oil are ranged from 10. 5 × 10~8 t to 11. 15 × 10~8 t,mostly contributed by Type-Ⅰ Resources which are about twice as many as Type-Ⅱ Resources; the resources decrease as follows: Sanzhao Sag > Daqing Placanticline > Longhupao Terrace > Gulong Sag > Chaoyanggou Anticline > Qijia Sag,of which resources Sanzhao Sag constitutes more than 31% of the total,while Daqing Placanticline constitutes 27%. The researches prove that not only Sanzhao Sag and Daqing Placanticline are rich in the resources,but also the quality of the resources is muchbetter,thus they has become the key regions of the further exploration.