RESEARCH ON THE SEQUENCE STRATIGRAPHY AND DEPOSITION SYSTEM IN YONGANZHEN DELTA, THE DONGYING SAG
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摘要: 应用高分辨率层序地层学理论,结合测井—地震数据联合分析等技术手段,建立了东营凹陷永安镇下第三系沙三段—沙二下亚段三角洲层序地层格架,划分出了4个三级层序,9个四级层序。沉积体系的研究结果表明,永安镇三角洲存在多个物源方向,不同时期主要物源方向不相同,但最主要的物源来自东部的青坨子凸起。通过重点分析永安镇三角洲的2个主要发育旋回LSC4和LSC3,有效地解剖永安镇三角洲的空间展布特征和物源方向,建立起沉积体系格架,并分析指出这2期砂体是主要的油气勘探目标。Abstract: Combining the theory of high-resolution sequence stratigraphy with the log-seismic data analysis,the framework of the strata sequence of Es3—Es2 for the Yonganzhen Delta in the Dongying Sag was established.In general it is divided into four third-level and nine fourth-level sequences.The sedimentary system study shows that there are several deposition sources in Yonganzhen Delta,and the main deposition sources in the various periods are different.But the most important deposition source is from the Qingtuozi uplift in the east.The article gave a detail analysis on the two main sedimentary cycles of LSC4 and LSC3,consequently got the result of distribution characteristics and deposition sources.And the sedimentary system framework was established.In the end it is considered that the sand bodys in these two periods are the main oil and gas exploration targets.
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