柯克亚背斜新生代构造变形时序厘定与油气地质意义

基于高分辨率三维地震数据体，以构造正演模拟和生长地层分析为约束条件，对柯克亚背斜的构造变形时序进行重新厘定。分析认为，新生代以来柯克亚背斜主体经历了中新世晚期、更新世早期和更新世中—晚期3个阶段不同性质构造运动的叠加。中新世晚期以低速率的水平推覆为主，在研究区卡拉塔尔组形成大量低角度顺层断裂；更新世早期柯克亚背斜主体处于相对稳定的构造低部位，以被动接受沉积为主；更新世中—晚期则以高速率的垂向隆升为主，在柯克亚背斜核部形成大量高角度调节断裂，导致更新统低部位厚层沉积被抬升到整个背斜的高部位，遭受剥蚀，形成现今的构造形态。新的构造发育模式下，柯克亚背斜核部和北翼发育多套优质储集层的叠置断块，多期断裂的叠加可有效改善局部储集层物性，促进深层油气向卡拉塔尔组调整运移、充注成藏。这深化了对柯克亚凝析气藏的认识，也为下步勘探开发提供了新的目标类型。

Cenozoic Tectonic Deformation Time Sequence and Its Geological Significance in Kekeya Anticline

Based on the high-resolution 3D seismic data and taking the structure forward modeling and growth strata analysis as constraint conditions, this paper redefines the structural deformation time sequence of the Kekeya anticline. The results show that Kekeya anticline underwent three periods of tectonic activity superpositions, namely Late Miocene, Early Pleistocene and Middle-Late Pleistocene during Cenozoic. The period of Late Miocene was characterized by horizontal overriding, during which a large number of low-angle faults were formed in the Kalatar formation. The Kekeya anticle was located at the lower structural positions in Early Pleistocene and was characterized by receiving deposits; the period of Middle-Late Pleistocene was characterized by high-speed vertical uplifting, during which a large number of high-angle adjusting faults occurred in the core of the anticline, resulting in the uplifting of the Pleistocene thick sediments at the lower positions to the higher positions of the anticline and the forming of the current structural shapes. With the new structure development pattern, several sets of superimposed fault blocks of high-quality reservoirs are found in the core and northern flank of Kekeya anticline. The superposition of multistage faults can effectively improve the physical properties of local reservoirs, and promote oil and gas migration and accumulation into the Kalatar formation, which deepens the understanding of Kekeya condensate reservoirs and provides new targets for further exploration and development