东营凹陷营北地区沙三中亚段重力流沉积特征

为了研究东营凹陷营北地区沙三中亚段(Es32)重力流沉积特征及演化,利用岩心、测井、录井和化验资料分析了其沉积特征,并细化了砂组,绘制了沉积微相图.结果表明:该区Es32重力流沉积可划分为水道控制型沉积和非水道控制型沉积2类.水道控制型沉积包括重力流水道和前端复合体2类沉积亚相,重力流水道亚相包括重力流水道微相和堤岸微...

Sedimentary characteristics of gravity flow of middle Es32 member in Yingbei area,Dongying Sag

To study the sedimentary characteristics and evolution of gravity flow of the middle third member of Shahejie Formation(Es₃²) in Yingbei area, Dongying Sag, the sedimentary characteristics were analyzed by using rock cores, well logging, logging and analysis test data, sand groups were refined, and sedimentary microfacies map was drawn. The results show that gravity flow sand bodies of Es₃² can be divided into channel-controlled deposit and non channel-controlled deposits. Channel-controlled deposit includes gravity flow channel and anterior complex subfacies. Gravity flow channel mainly includes gravity-flow channel and embankment microfacies, and anterior complex includes channelized lobes, tongue-like debris, turbidite lobes and turbidite sheet sands. Non channel controlled deposits mainly includes slide and slump. The sedimentary evolution model is:During the sedimentary period of Z₆-Z₄ sand groups, the water was relatively deep, which was mainly developed as the gravity flow deposition. During the sedimentary period of Z₃-Z₁ sand groups, with the decline of the lake level, shallow lake delta mouth bar sand bodies were developed in the east of the study area, and gravity flow deposit was mainly developed in the middle and west. This sedimentary evolution model of gravity flow can provide a geological model for reservoir prediction in the study area.