东营凹陷滨县凸起南坡砂砾岩体成因模式与成藏规律

SANDBODY FORMATION MODELS AND POOL-FORMING REGULATIONS IN THE SOUTHERN SLOPE OF BINXIAN PROMINENCE OF DONGYING SAG

应用现代沉积学和油气成藏动力学理论和新方法 ,探讨了东营凹陷西北部陡坡带沙三、沙四段砂砾岩扇体成因模式、分布规律和油气成藏机理 ,对砾岩扇体油气藏分布规律进行了预测。研究结果表明 ,沙三、沙四段主要发育扇三角洲砂砾岩扇体 ,受边界断裂活动强度和古隆起的双重控制 ,砂砾岩扇体沿滨县凸起南坡平行走向呈带状分布并遵循沟扇对应关系 ,以物源近、规模小为特点 ,扇体自下而上发育强度依次减弱。扇三角洲砂砾岩体大都伸入到烃源岩丰富的湖相暗色泥岩中 ,富含油气 ,油气成藏具有分带性。低台阶以断鼻、滚动背斜油气藏为主 ;中台阶以断块岩性油气藏为主 ;

Based on the sequence stratigraphy, the modern sedimentary theory and pool forming dynamics, the diagenesis model and distribution of sandstone fan body,as well as pool forming mechanism of sandbodies in abrupt slope of Dongying seg were studied. The main sedimentary system developed the sandy conglomerate fan bodies of fan delta in Shahejie formation. Under the control of the strong fault and paleohigh, these fan bodies are distributed in parallel to the southern slope of Binxian Prominence. These sandy conglomerate fan bodies have the small and near sources, and the developing degrees decreased gradually from bottom to top. The pool forming regulations of the sandy conglomerate reservoir are different. The fault reservoirs occured in lower fault block, and the traps occured in median block, and lithological reservoirs occured in high block.