黄骅坳陷中区古构造对古近系储集体控制作用

CONTROLLING OF STRUCTURE ON THE PALEOGENE SEDIMENTARY SANDS BODIES IN THE CENTRAL PART OF HUANGHUA DEPRESSION

黄骅坳陷中区古近系经历了断陷、拗陷两大发育阶段,沉积与古构造活动关系密切.沙三段—沙二段时期是断陷活动期,沉积相带、沉积厚度受边界同沉积断裂及内部同沉积断裂控制,扇三角洲、近岸水下扇体系广泛发育.沙一段时期,研究区进入断-坳转换阶段,坳陷基底总体平缓,差异断陷作用减弱,整体沉降增强.在湖盆水体长期改造作用下,滨岸沙坝为该时期典型沉积类型.东营组时期,拗陷活动增强,坳陷坡度进一步增加,湖泊三角洲体系全面发育.通过对黄骅坳陷中区古近系古构造活动对沉积体系、骨架砂体控制作用研究,明确了储集体与构造体系配置关系,对该区隐蔽油藏勘探和井位部署具一定指导意义.

Paleogene system in the central part of Huanghua Depression undergo two evolutive phases of downfaulted and depression basin,and its structural activity is tightly relative to sedimentation. The second-third member of the Shahejie formation is the phase of downfaulted basin,sedimentary facies and thickness is controlled by boundary and interior consedimental faults. Fan delta system and inshore subaqueous fan system are extensive development. During the first member of the Shahejie formation,research area turn into the switch phase of downfaulted and depression basin,the floor is rated and the action of diversity downfault is weakened, however, the integer sedimentation boosted up. Under the lasting reconstruct influence of lake-basin water body, coastal bar is the representative sedimentary type. The action of depression boosted up and gradient increased in the Dongying formation. Lacustrine-delta system is comprehensive development. Paleogene palaeostructral activity in the central part of Huanghua depression and its control on settlement system and skeletal sand are studied to find the arrangement relation between reservoir and fracture system.It＇s of great importance to next exploration for subtle reservoirs.