海拉尔盆地苏德尔特地区古潜山特征与成因

布达特群古潜山油气藏是海拉尔盆地苏德尔特地区的主要油气藏类型，发育于三叠系浅变质的砂、泥岩地层顶部，储层有效厚度由几十米到100余 m。储集空间类型属于孔隙-裂缝双孔介质储层，平均孔隙度5.0%，平均渗透率0.03×10^-3 μm²。按成因本区古潜山可分为断块型和古隆起剥蚀型。印支期区域挤压隆升、印支期-燕山早期长期暴露剥蚀、燕山期差异块断是本区古潜山形成的动因；风化作用、流体活动和构造破裂作用是储集空间形成的主控因素。

Geological Features and Genetic Interpretation of Sudeerte Buried-Hill Traps of Hailaer Basin, NE China

The Sudeerte buried hills are very important reservoirs in the Hailaer Basin. The best reservoirs are generally developed on top of the Triassic metamorphosed silici clastic rocks called Budate Group and with a thickness from several tens to over 100 meters. The so called bi media pore spaces composed of pore and fractures are the prevailing reservoir types with mean porosity of 5.0% and permeability of 0.03×10^-3μm². Two genetic types of the buried hills can be recognized, faulted block and weathered peleo uplift. With southwards subduction of the Mongolia Okhotsk plate north of the studied area during Triassic to early Cretaceous, the Hailaer Basin suffered uplifting and weathering, secondary burying and block faulting, volcanism and fluid alteration, which constructed the buried hill reservoirs there.