西准噶尔界山前陆盆地晚期（T—J）层序地层与油气勘探

SEQUENCE STRATIGRAPHY OF THE LATE FORELAND BASIN(T—J)IN THE WEST JUNGGAR BOUNDARY MOUNTAINS AND PETROLEUM EXPLORATION

提出了西准噶尔界山前陆盆地发育晚期(T—J)的层序地层学模式及油气勘探预测模型。在同生断裂边缘以湖水与界面断裂的交线为“陆架边角”,克乌断裂带附近为“坡折带”。各体系域所含沉积体系与海相模式不尽相同,Ⅰ型层序体系域构成齐全,Ⅱ型层序缺少低位体系域,Ⅱ型界面之上直接覆盖湖进体系域,反映了湖盆基准面升降频度。三叠—株罗系可划分为3个层序和4个准层序,富砂的高位体系域“扇三角洲—浊积扇”等一系列储集层是今后勘探开发的重要对象。

In this work,we proposed the sequence stratigraphy model of the late foreland basin (T-J) in the west Junggarboundary mountains and the prediction model of oil and gas exploration. At the edge of growth fault, the crossline oflake water and boundary fault was the edge angle of continental shelf,Major Karamay-Urho faulting zone was thefolding slope zone. The depositional systems in each system tract were not all the same as marine patterns. Type Ⅰ se-quence system tract included all the composition,type Ⅱ sequence was lack of low level system tract. Type Ⅱ boundarysurface was covered directly with transgresive system tract and reflected the eustatic frequency of lacustrine levelchange. Triassic-Jurassic was divided into 3 sequences and 4 quasi-sequences,and fan delta-turbidite fan and other se-ries of reservoirs in high level system tract which was rich in sand were pointed to be important targets in the future oilexploration and development.