Log spectrum analysis and its geological significance on delta front formation of Shengtuo Oilfield

详细信息   

• 责任者：Yan Ke (Postdoctoral Workstation of Shengli Oilfield ; SINOPEC ; Dongying 257002 ; China) ; Bi Yiquan
• 刊名：Fault-Block Oil and Gas Fields
• 出版年：2012
• 卷期：19(4)
• 页码：p.541-544
• issnNo：ISSN1005-8907
• isbnNo：CN41-1219/TE

摘要

Taking the delta front formation of Es2s sands of Shengtuo Oilfield in Dongying Depression as an example, the maximum entropy spectrum analysis and predication error fiher analysis were utilized to describe the logging frequency spectrum features and reveal the geological significance. The study shows that the cycle sequence in the delta front formation is controlled by the earth orbit cycle, and the spectrum feature presents as the superimposition of Milankovitch cycle and non-Milankovitch cycle. The Milankovitch cycles are dominant in the delta front formation and are conserved mainly in equivalent layer, which reflect the similar or gradual- change depositional environments and continuous depositional process. The intervals corresponding with non-Milankovitch cycles occupy a small proportion, and they exited mainly in the strata between two-stage delta front formations, which reflec, t the discontinuous deposition and the abrupt change of depositional environment and can act as a criterion to distinguish the depositional interface. Based on the spectrum trend curve, the delta front reservoir of Es 2 8 sands in Shengtuo Oilfieht can be divided into two integral middle-term base level cycle, which revealed the genesis and sedimentary process of formation reasonably.