Relationship between Dongying delta of Dongying depression and formation of salt-shale structure in central uplift and meaning in exploration of subtle oil/gas reservoir
Sun Chang-xu1, Cui Yong-gang1, Luo Wen-sheng2, Qu Chang-sheng2
S00406, No.29, Xueyuan Road, Haidian District, Beijing City, 100083, China
Abstract:Dongying delta is typical river-controlled delta developed along the long axis direction of Dongying sag. Many deltas have been developed in the east and south parts of Dongying sag in mid-latter stage of fault depression, among which the Dongying sag is the broadest developed area, the longest developed time and has the biggest influence on palaeotopography and sedimentary action. The study by using fine 3-D seismic, logging and drilling data showed the Dongying delta of Dongying sag has important meaning for the formation of central uplift zone, especially for the salt-shale structure in Liangjialou-Xianhezhuang structural zone. It is considered, by using the basic principle of high-resolution sequence-stratigraphy and structural analysis and through combining the prograding process of Dongying delta with uppe-bend action of salt-shale structure, that significant thickness of delta prograding body is trigger factor of forming the salt-shale structure.The more important is,because of the formation of salt-shale structure, the sedimentary slope suddenly become steep, adding the progressively prograding of delta. Finally, the gravity slumping and diapir movement lead to form the growth fault and further form the structural slope break zone: on the one hand, slumping turbidite bodies have been formed in delta front; on the other hand, the sand bodies relative to structural slope break, for example the lower fan system, have been formed. Creating the relation mode among the delta prograding body, salt-shale structure and structural slope break has important meaning for exploration of subtle oil/gas reservoir
孙昶旭, 崔永刚, 罗文生, 曲长胜. 东营凹陷东营三角洲与中央隆起带盐—泥构造形成的关系及其对隐蔽油气藏勘探的意义[J]. 石油地球物理勘探, 2006, 41(4): 462-467.
Sun Chang-xu, Cui Yong-gang, Luo Wen-sheng, Qu Chang-sheng. Relationship between Dongying delta of Dongying depression and formation of salt-shale structure in central uplift and meaning in exploration of subtle oil/gas reservoir. OGP, 2006, 41(4): 462-467.