Seismic Sedimentology of the Lower Part of the First Member of Shahejie Formation in Lixian Slope of Raoyang Sag, Jizhong Depression, China(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2019年第01期
- Page:
- 54-68
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Seismic Sedimentology of the Lower Part of the First Member of Shahejie Formation in Lixian Slope of Raoyang Sag, Jizhong Depression, China
- Author(s):
- ZHANG Yi-ming; GE Jia-wang; ZHANG Rui-feng; CHEN He-he; XIE Shi-jian; FENG Guang-ye; MENG Jing
- 1. Huabei Oilfield Company, PetroChina, Renqiu 062552, Hebei, China; 2. College of Geosciences, China University of Petroleum, Beijing 102249, China; 3. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, Sichuan, China
- Keywords:
- seismic sedimentology; shallow-water delta; the first member of Shahejie Formation; beach-bar; depositional evolution; sandstone distribution; Raoyang sag; Jizhong depression
- PACS:
- P512.2
- DOI:
- -
- Abstract:
- The Lixian slope of Raoyang sag in Jizhong depression has received numerous attentions because of its richness in oil and gas production. With the improvement of petroleum exploration and exploitation, the lithologic-stratigraphic reservoirs are becoming an important target for petroleum promotion, and identifying the genetic types and distribution and evolution of sand bodies is the key of efficient petroleum exploration and exploitation. The seismic sedimentology of the lower part of the first member of Shahejie Formation in Lixian slope was studied based on core, well logging and three-dimensional seismic data. The study interval corresponds to a set of a fourth-order sequence, which is bounded by T4 and T42 seismic markers, respectively, and the seismic marker of T43 is also identified internally; thus, the lower part of the first member of Shahejie Formation can be subdivided into the bottom sandstone section and the special lithologic section. The bottom sandstone section related to the shallow-water deltaic origin can be subdivided into three sub-facies types, including shallow-water delta plain, shallow-water delta front (inner front and outer front) and pro-shallow-water delta; the special lithologic section is characterized by lacustrine beach-bar deposits, and the types of the associated sand bodies are predominantly constituted by sandy clastic beach-bar, followed by carbonate beach-bar. During the sedimentary period of bottom sandstone section, the shallow-water delta system shows obvious zonation in plane, and the underwater distributary channel sandstones in the inner front of the shallow-water delta has a wide distribution range with a maximum transport distance of 15 km, which are proven good reservoirs in the study area; from early to late, with the lake level rising gradually, the sediments provided by the southwestern provenance gradually become predominant, while the supply from the northern provenance system shrinks. During the sedimentary period of special lithologic section, the lake level rises abruptly. Consequently, the shallow-water delta system almost withdraws from the study area, and the shallow lake to deep lake together with beach-bar deposits become dominated, and the main type of the associated sand bodies is sandy clastic beach-bar, which is located in the eastern part of the study area (the area is about 12 km2) with paralleling to the lake shoreline in a strip geometry. Based on sedimentology and seismic sedimentology, the depositional models of the bottom sandstone section and the special lithologic section are established, which can provide potential references for reservoirs prediction and petroleum exploration and exploitation in the future.
Last Update: 2019-01-25