摘要
塔河油田奥陶系油藏属于多期构造和岩溶作用形成缝洞型碳酸盐岩油藏,缝洞系统受控于岩溶作用,岩溶作用强烈程度明显受控于古地貌形态.本文利用层序地层学理论,重点突出地层的等时格架,利用层序界面的等时性研究古地貌.以塔河油田6区为例,提出下石炭统中下部双峰灰岩属于海进体系域的最大海泛期沉积,是一明显且横向可对比的沉积层;同时奥陶系顶面属于风化剥蚀面,亦属于等时界面.利用两个等时界面进行岩溶古地貌恢复,划分出岩溶高低、岩溶斜坡等,进而预测次生孔隙发育区块,最终指导与岩溶有关的油气勘探和开发工作.
Tahe Ordovician reservoir belongs to carbonate rock reservoir which is transformed by multi-period tectonic movement and multi-stage certifications with complex crack- cavity system. The effective pores of crack- cavity system are controlled by multi-stage certifications evidently controlled by pattern of ancient topographic feature. The authors make full use of achievement and theory in sequence stratigraphy, centre on stratigraphic architecture are same period, and forecast pattern of ancient topographic feature by the sequence of the identical time. With the Tahe reservior 6 for the example, put forward that 搕win peak-like carbonate?form on transgressive system tract in high relative sea level period in the later of carboniferous. The twin peak-like carbonate sedimentation is evident and can contrast well in broad wise. Meantime the top of Ordovician also belongs to same period surface which formed by long period erode. By two same period surfaces, the authors can recover ancient topographic feature of the later of carboniferous, and divide karst landform into height, slope and so on. Thought below studying, the area of the secondary interstice can be forecast in karst landform, and can direct oil-gas exploration and development on karst reservoir.
出处
《新疆地质》
CAS
CSCD
2003年第3期290-292,共3页
Xinjiang Geology
关键词
层序地层学
岩溶
古地貌恢复
塔河油田
Sequence stratigraphy
Ancient Geomography recovery
Karst
Tahe oilfield
Oil and gas
