【摘要】 横向低凸起常因残余面积小,而在物源体系中未得到重视。利用高分辨率三维地震资料,通过断裂组合、断层接触关系、垂向位移和上下盘地层厚度等特征的识别,在辽东湾地区辽西低凸起锦州25地区识别出同向叠覆型和同向趋近型两类构造转换带。采用"点面反馈,源体比对"的思路,依据钻井岩相、宏观地震相和地震属性的分析,结合砂岩重矿物组合、ZTR指数和成分成熟度等资料,在研究区沙三段识别出3类与低凸起具有成因联系的沉积相:构造转换型扇三角洲、陡坡坡折型近岸水下扇和凸缘末梢交叉断裂型扇三角洲,建立了低凸起差异物源分配模式。同时,结合钻井泥岩声波时差中地层剥蚀的响应,提出易于风化的母岩、剥蚀区动态变化和高效物源通道是低凸起围区砂体能够富集的根本原因。构造转换带型扇三角洲对解决该地区小物源贫砂问题意义重大。更多还原

【Abstract】 Few attention has been paid to the Liaoxi Lateral Low Uplift in provenance system analyses due to its small residual area.Using high resolution three dimensional seismic data,through analyses of the combination and contact of faults,vertical displacement and the thickness of strata of the hanging wall and foot wall,synthetic-overlapping and synthetic approaching tectonic transition belts exist in JZ25 area in the Liaoxi Lateral Low Uplift of Liaodongwan Bay area.Based on drilling litho facies,seismic facies,seismic attribute analyses,heavy mineral assemblage of sandstone,ZTR index and composition maturity,three types of sedimentary facies are identifid,including tectonic transition fan delta,steep slope subaqueous fan and peripheral rift fan delta.Combining with strata erosion response of mudstone acoustic time difference.The authors propose that sandbody accumulation depends on mother rock easily being wea-thered,dynamic change of erosion area and efficient provenance path.The tectonic transition fan delta is important for improving the sandbody-lacking status in the relatively small provenance area.更多还原