Tectonic Evolution of Songnan-Baodao Sag in Qiongdongnan Basin and Its Relationship with Oil-gas Reservoir

doi:10.19657/j.geoscience.1000-8527.2022.057

Abstract

Abstract:

The Songnan-Baodao depression is an important exploration area with great oil-gas exploration and development potential in the Qiongdongnan Basin (after the Yacheng-Lingshui Depression), and its tectonic evolution, tectonic style and prototype basin restoration are of great significance to understand the oil and gas accumulation regularities. Based on seismic data interpretation, we used 2DMove software to analyze the tectonic evolution period and the spread regularities of tectonic patterns of the Songnan-Baodao depression, and restored the characteristics of Paleogene prototype basins. The results show that the tectonic-sedimentary evolution of the Songnan-Baodao depression can be divided into six stages in three periods (pre-rift, syn-rift and post-rift), and the structural styles comprise three major categories and 14 sub-categories of simultaneous deformation styles, and simultaneous style and multistage style assemblages. Eight dustpan-like fault deposits were recovered in the local Paleogene prototype basins, with sediment thickness of 3,000-6,000 m. Preservation status of the three types of Paleogene prototype basins in the strong, medium and weak transformation areas were identified, and the local erosion thickness exceeds 5,000 m. The oil and gas transport characteristics of the Songnan-Baodao depression are characterized by source proximal, high maturity and late accumulation, and the Songtao bulge, Lingshui low bulge and Songnan bulge at the periphery represent both the oil-gas transport directional zones and effective traps of buried-hill and nappe structure, stratigraphic lithology, and inverted anticline. accumulation match the large-scale hydrocarbon generation period, which are favorable for oil and gas exploration.

Key words: tectonic evolution, tectonic style, prototype basin, accumulation characteristic, Songnan-Baodaodepression

CLC Number:

P642

WANG Kai, WANG Genhou, JIA Qingjun, ZHANG Xiao. Tectonic Evolution of Songnan-Baodao Sag in Qiongdongnan Basin and Its Relationship with Oil-gas Reservoir[J]. Geoscience, 2023, 37(02): 245-258.

Figures/Tables 9

Fig.1 Tectonic zoning map of the Qiongdongnan Basin[13-14]

Fig.2 Stratigraphic framework of the Songnan-Baodao sag and its adjacent areas

Fig.3 Structural evolution maps of L1 lateral line in the Songnan-Baodao sag

Fig.4 Geological interpretation of seismic profile series of the Songnan-Baodao sag (modified after Zhou et al.[14];seeing Fig.1 for profile location)

Fig.5 Classification of structural styles of the Songnan-Baodao sag and its periphery (Ⅰ⑥ and Ⅲ④ modified from Yang et al.[16])

Fig.6 Reconstruction of Paleogene prototype basin in the Songnan-Baodao sag and adjacent area

Fig.7 Distribution map of burial history in the Songnan-Baodao Sag and adjacent area

Table 1 Comparison of the burial history of the Songnan-Baodao sag and adjacent area with the thermal evolution degree of source rocks

井名	构造带	埋深(m)							热演化程度
井名	构造带	E₃y末	珠琼运动后	E₃l末	南海运动后	N₁m末	东沙运动后	现今	热演化程度
X1	松南凹陷	1700	1200	3400	3000	5100	4500	6700	高成熟
X2	宝岛凹陷	1800	1300	3400	3200	5250	4750	7500	高成熟
B19-2n-1	松涛凸起	1300	800	2850	2500	4100	3600	5600	中-晚成熟
S2-4-1	松南凹陷西斜坡	1200	750	1800	1450	3250	2750	5550	中-晚成熟
X3	宝岛凹陷东斜坡	800	350	800	470	1570	1070	3570	低-中成熟
X4	松南低凸起	0	0	500	200	800	300	3000	无烃源岩

Fig.8 Schematic model of oil and gas transport patterns in the Baodao depression and adjacent area in the Qiongdongnan Basin

References 27

[1]	MELLO M, AZAMBUJA N C, MIO E D, et al. The super giant sub-salt hydrocarbon province of the Greater Campos Basin[R]. Brazil: AAPG International Conference and Exhibition, 2009.
[2]	杨丽丽, 王陆新, 潘继平. 全球深水油气勘探开发现状、前景及启示[J]. 中国矿业, 2017, 26(增2):14-17.
[3]	温志新, 王兆明, 宋成鹏, 等. 东非被动大陆边缘盆地结构构造差异与油气勘探[J]. 石油勘探与开发, 2015, 42(5):671-680.
[4]	谢辉, 区浩瑛, 石红才, 等. 南海北部陆坡深水区新生代沉积演化东西部对比分析[J]. 广东海洋大学学报, 2020, 40(4):41-50.
[5]	张迎朝, 甘军, 徐新德, 等. 琼东南盆地海相烃源岩的发现与勘探意义[J]. 煤炭技术, 2020, 39(2):43-45.
[6]	赵燚林, 马遵青, 陈国俊, 等. 琼东南盆地松南—宝岛凹陷梅山组碎屑岩储集性及成岩作用研究[J]. 沉积与特提斯地质, 2019, 39(4):14-26.
[7]	朱沛苑, 元庆涛, 尤丽, 等. 琼东南盆地宝岛区陵水组储层特征与有利储层分布[J]. 天然气技术与经济, 2020, 14(1):15-20. DOI
[8]	李兴, 甘军, 杨希冰, 等. 琼东南盆地深水东区古潜山领域天然气来源及运移表征[J]. 天然气地球科学, 2020, 31(7):970-979.
[9]	钱坤. 南海扩张过程及海陆变迁演化:民都洛新生代地层记录[D]. 广州: 中国科学院研究生院广州地球化学研究所, 2016.
[10]	雷超, 任建业, 裴健翔, 等. 琼东南盆地深水区构造格局和幕式演化过程[J]. 地球科学, 2011, 36(1):151-162.
[11]	舒良树. 华南前泥盆纪构造演化:从华夏地块到加里东期造山带[J]. 高校地质学报, 2006, 12(4):418-431.
[12]	王建强, 梁杰, 陈建文, 等. 中国海域基岩油气藏特征及未来勘探方向[J]. 海洋地质与第四纪地质, 2021, 41(6):151-162.
[13]	廖计华, 王华, 吕明, 等. 琼东南盆地深水区松南—宝岛凹陷同沉积断裂活动及其对沉积充填的控制[J]. 中国矿业大学学报, 2016, 45(2):336-346.
[14]	周杰, 杨希冰, 杨金海, 等. 琼东南盆地松南低凸起古近系构造-沉积演化特征与天然气成藏[J]. 地球科学, 2019, 44(8):2704-2716.
[15]	汪锴. 琼东南盆地松南—宝岛凹陷的构造演化和古近纪原型恢复[D]. 北京: 中国地质大学(北京), 2021.
[16]	杨金海, 杨希冰, 周杰, 等. 琼东南盆地深水区松南—宝岛凹陷反转构造带发育特征及油气地质意义[J]. 海洋学报, 2019, 41(5):97-106.
[17]	茹克. 裂陷盆地的半地堑分析[J]. 中国海上油气(地质), 1990, 4(6):1-10.
[18]	陈发景, 汪新文, 陈昭年. 不同期伸展断陷的叠合类型[J]. 现代地质, 2011, 25(5):889-895.
[19]	陈发景, 汪新文, 陈昭年, 等. 伸展断陷盆地分析[M]. 北京: 地质出版社, 2004.
[20]	ALLEN P A, ALLEN J R. Basin Analysis[M]. London: John Wiley & Sons, Ltd, 2008.
[21]	华北石油勘探开发设计研究院. 潜山油气藏[M]. 北京: 石油工业出版社, 1982.
[22]	刘和甫, 梁慧社, 李晓清, 等. 中国东部中新生代裂陷盆地与伸展山岭耦合机制[J]. 地学前缘, 2000, 7(4):477-486.
[23]	姚超, 角贵浩, 王同和, 等. 中国含油气构造样式[M]. 北京: 石油工业出版社, 2004.
[24]	何家雄. 南海北部边缘盆地二氧化碳地质及资源化利用[M]. 北京: 石油工业出版社, 2009.
[25]	何仕斌, 张功成, 米立军, 等. 南海北部大陆边缘盆地深水区储层类型及沉积演化[J]. 石油学报, 2007, 28(5):51-56. DOI
[26]	王艳. 南海琼东南盆地深水区储层类型及研究意义[J]. 沉积与特提斯地质, 2014, 34(3):82-87.
[27]	李绪宣. 琼东南盆地构造动力学演化及油气成藏研究[D]. 广州: 中国科学院研究生院广州地球化学研究所, 2004.