Characteristics of Unconformity Structure Between Palaeogene Dongying Formation and Shahejie Formation in No.3 Tectonic Region of Nanpu Sag
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2018年第03期
- Page:
- 322-333
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Characteristics of Unconformity Structure Between Palaeogene Dongying Formation and Shahejie Formation in No.3 Tectonic Region of Nanpu Sag
- Author(s):
- OUYANG Li-ming; YANG Shao-chun; ZHANG Bo-ming; FENG Jian-wei; HE Ni-qian; WANG Xi-dong; WANG Ya
- 1. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China; 2. Research Institute of Petroleum Exploration and Development, Jidong Oilfield Company, PetroChina, Tangshan 063004, Hebei, China; 3.Chongqing Fuling Shale Gas Exploration and Development Company, SINOPEC, Chongqing 408014, China
- Keywords:
- unconformity structure; Dongying Formation; Shahejie Formation; 3D seismic; logging response; spatial distribution; Nanpu sag
- PACS:
- P542+.34
- DOI:
- -
- Abstract:
- The unconformity structure between Palaeogene Dongying Formation and Shahejie Formation (Ed/Es) in Nanpu sag is widely developed, and the development characteristics are different in distinct regions, especially in No.3 tectonic region of Nanpu sag. Combined with 3D seismic, well logging curves, drilling core, physical analysis and other data, the characteristics of lithology, logging response, physical property and spatial distribution of Ed/Es unconformity structure in No.3 tectonic region of Nanpu sag were systematically analyzed. The results show that Ed/Es unconformity structure can be divided into rocks above the unconformity, weathering clay layer and semi-weathered layer, and the development degree of weathering clay layer is low; the unconformity structure has different characteristics of lithology, the rocks above the unconformity have the lowest weathering degree and high shale content, and the weathering clay layer has high weathering degree and the worst physical property, while the semi-weathered layer suffers strongly modification and has the best physical property; the distributions of unconformity structure are more consistent in plane and space, and the rocks above the unconformity and the semi-weathered layer are more developed along the parallel direction of sediment sources, and are lower developed along the vertical direction of sediment sources, while the weathered clay layer is developed in the middle area along the vertical direction of sediment sources, and is undeveloped along the parallel direction of sediment sources; the heterogeneity of development degree of unconformity structure has different effects on oil and gas, the rocks above the unconformity and the weathering clay layer are mainly as sealing barrier for oil and gas, and the semi-weathered layer is mainly as a carrier bed of oil and gas migration.
Last Update: 2018-06-05