Oil and Gas

Biography

Biography: Zhang Tianjiao

Abstract

The Qingnan sub-sag is located within the Dongying Sag, Jiyang Depression, Bohai Bay Basin, on-shore China. This sub-sag was indicated as a promising exploration area, however, compared to the other sub-sags in the Dongying Sag, the characters and distribution characteristics of Qingnan sub-sag remain poorly understood which restricts the oil and gas exploration in this region. A regional study, involving core observation, well-logging, 3-D seismic, sporopollen, organic carbon content, characteristic elements and heavy mineral, has been undertaken. The fan delta, delta and beach bar were recognized based on 20 core observation and well-logging data. The paleogeomorphic shows stable shallow semi-enclosed sub-sag based on the 3-D seismic data covering the region, making the paleo-hydrodynamic power weak. The paleo-climate is humid and hot which is indentified by sporopollen fossil, including pinaceae, granodiscus and quercoidites. Two provenance systems were recognized based on the characteristic elements and heavy mineral. All the analysis show that: 1) the gentle paleogeomorphic is advantage of the development of fan delta, delta and beach bar; 2) the humid and hot paleo-climate provides accommodation space and protection for the clastic sedimentary of fan delta and delta; 3) the fan delta is controlled by the north provenance system, the delta is controlled by the south provenance system, beach bar is controlled by the both; 4) the weak power of paleo-hydrodynamic restrict the distribution range of beach bar.The results make the distribution regularity of sedimentary facies clear and will help the oil and gas exploration in the region.