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辽西凹陷Z区位于辽东湾海域西南部,已在古近系发现了绥中36-1亿吨级油田,展示了辽西南洼为富烃洼陷,具有巨大的油气勘探潜力。以古近系东营组为目标层系,综合分析全区的古生物、岩心、录井、测井及地震资料,将Z区东营组划分为3个三级层序,自下而上分别为SQd3、SQd2和SQd1,其中SQd3、SQd2均可进一步划分出湖扩域和高位域不同的层序界面在古生物、岩性、测井响应、地震反射特征上存在一定差异。构造—古地貌对层序具有明显的控制作用。在斜坡高部位和凸起区,东营组超覆于基岩之上,上覆馆陶组与东营组之间有明显的削截现象。东营组各三级层序内部,总体上表现出从水进到水退的沉积旋回,且具有不同的岩性、测井响应及地震反射特征。
Area Z of Liaoxi Depression is located in the southwestern part of Liaodong Bay. In the Paleogene, a 3,600-million-ton oilfield in Suizhong was discovered, demonstrating that the southwest of Liaoning Province is a hydrocarbon-rich depression with great potential for oil and gas exploration. Taking the Dongying Formation of the Paleogene as the target strata, the Dongying Formation in the Z zone is divided into three third-order sequences by comprehensive analysis of the paleontology, core, logging, logging and seismic data in the whole area. The sequence is SQd3 , SQd2 and SQd1, among which SQd3 and SQd2 can be further divided into different sequence sequences of the lake expansion domain and the high domain. There are some differences in paleontology, lithology, well logging response and seismic reflection characteristics. Tectonic-paleogeomorphology has obvious control over the sequence. In the high part of the slope and the raised area, the Dongying Formation overlies the bedrock, and there is a clear cut-off phenomenon between the upper Guantao Formation and the Dongying Formation. Dongying Formation within the third-order sequences generally show sedimentary cycles from water to water and have different lithology, well logging response and seismic reflection characteristics.