松辽盆地北部树25-尚2区块断裂特征及其对成藏的控制作用

研究区断层全部为正断层，平面上划分为4条断裂带。T2(泉头组顶面)层及其以下层位断裂条带性好，主要有南北向转北西向再转南北向的发育特点，T₂层以上由于北东向和近东西向晚期断层的加入使得断裂条带不明显。纵向上主要是堑垒相间的发育样式。研究认为本区共分为4期断裂，其中以中、晚期断裂最为发育，同时与油气运移与聚集关系最为紧密。中期和长期继承性断裂以运移作用为主而晚期断裂以保存作用为主。断裂对本区油藏形成具有明显的控制作用，石油被断裂沟通，以侧向运移为主，油藏类型主要为断层-岩性油藏，油气丰度由西向东逐渐递减且富油层位逐步抬升。

FAULT FEATURES AND THEIR CONTROLS TO RESERVOIR FORMATION IN SHU25-SHANG2 BLOCK IN NORTHERN SONGLIAO BASIN

〗Faults in study area are normal faults which are classified into four zones in plan. T2 (Quantou formation top) and its underlying layers are clear in fault zonation, striking SN and to NW and to SN. Above T2, fault zonation is poor due to a later reshaping from NE-and EW-striking faults. These faults display a rift-gabben developing mode. Faults are classified as four stages, of which medium and late faults are developed, closely connected to oil-gas migration and concentration. Inheritance faults play a role in migration in a middle- to long-term and in preservation in later stage. Faults control the formation of oil reservoir that oil is connected by faults through lateral migration. The oil-gas reservoir type is mainly fault lithology type with oil-gas concentration descending eastward, but ascending level in oil-bearing sequences.