Cenozoic Sequence Stratigraphy and Lithostratigraphic Traps in Wan'an Basin, the Southwestern South China Sea
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摘要: 利用地震、钻井及古生物等方面的资料进行综合研究, 根据沉积层序边界特征和沉积旋回的组合关系, 将万安盆地新生代地层划分为3个超层序、6个层序组和10个三级层序; 进而分析万安盆地新生代沉积演化过程, 认为万安盆地从古新世—始新世开始沉降, 直至第四纪总体表现为逐渐海侵的过程, SSQ1和SSQ2层序组以陆相断陷湖盆沉积为主, SSQ3、SSQ4、SSQ5和SSQ6层序组为海陆过渡相和海相沉积; 最后通过井震对比分析对典型剖面的岩相及沉积相进行解译, 识别并预测了多种岩性地层圈闭, 包括低位域中的盆底扇、浊积扇、塌积扇, 海侵域中的上倾尖灭砂体以及高位域中的三角洲砂体和生物礁滩等岩性地层圈闭.Abstract: Wan'an basin, as a typical Cenozoic transtensional basin, is one of the most important petroliferous basins in the southwestern of South China Sea.In this study, using seismic, drilling and some palaeontologic data, the Cenozoic sequence stratum pattern in Wan'an basin is established, which is subdivided into three super-sequences, six secondary sequences and ten tertiary sequences.In this sequence, the depositional process of Cenozoic strata in Wan'an basin is interpreted as gradually transgression based on comparative study of seismic and drilling data.SSQ1 and SSQ2 sequences are predominantly composed of lacustrine deposits during syn-rift.And SSQ3, SSQ4, SSQ5 as well as SSQ6 sequences are characterized by transitional facies and marine deposit.According to the interpretation of the lithofacies and sedimentary facies from typical seismic profiles, several kinds of lithostratigraphic traps are recognized and predicted, including basin floor fan, turbidite fan and colluvial mass in low-stand system tracts; upward wedge-out sands in transgressive system tracts; and delta sands and biohermal suite in high-stand system tracts.
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Key words:
- petroleum geology /
- lithostratigraphic traps /
- sedimentation /
- sequence stratigraphy /
- Wan'an basin
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图 1 万安盆地构造分区(据杨木壮等, 2003略作修改)
Fig. 1. The tectonic subdivision of the Wan'an basin
图 2 万安盆地综合地层柱状图及层序地层格架(据杨木壮等, 2003修改)
Fig. 2. Comprehensive stratigraphy and sequence framework of Wan'an basin
图 3 万安盆地主要地震界面反射特征(WA282测线)
Fig. 3. Seismic reflection characteristics from the Wan'an basin
图 4 万安盆地Dua-1x井李准组岩性及测井曲线特征
Fig. 4. Lithology and log analysis from Lizhun Formation in the Well-Dua-1x
图 5 万安盆地过12C-1x、12B-1x、Dua-1x、AM-1x连井剖面(位置见图 1)
Fig. 5. Well correlation cross-section crossing 12C-1x, 12B-1x, Dua-1x and AM-1x in Wan'an basin
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