琼东南盆地北部中生代凹陷特征及油气成藏条件初探

朱继田; 杨希冰; 胡向阳; 罗威; 李勇; 毛雪莲; 冯士信

doi:10.19509/j.cnki.dzkq.2022.0219

琼东南盆地北部中生代凹陷特征及油气成藏条件初探

doi: 10.19509/j.cnki.dzkq.2022.0219

中海石油(中国)有限公司海南分公司, 海口 524057

基金项目:

中海油重大综合科研项目"南海西部近海大中型天然气田勘探潜力与突破方向"

详细信息

作者简介:
朱继田(1974-), 男, 高级工程师, 主要从事石油天然气地质综合研究工作。E-mail: zhujt@cnooc.com.cn

中图分类号: P618.13
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出版历程
- 收稿日期: 2021-09-15

Characteristic and petroleum geology of the Mesozoic sags of the northern Qiongdongnan Basin

Hainan Branch of CNOOC Ltd., Haikou 524057, China

摘要

摘要:
琼东南盆地的中生代凹陷群是扩大油气勘探发现的远景区。为了实现琼东南盆地中生界的勘探突破，急需落实中生代凹陷的油气成藏条件和有利勘探领域。基于地球物理、地球化学、钻井资料及古生物资料，首次对琼东南盆地中生代凹陷开展了深入系统的分析研究。研究表明，在琼东南盆地北部崖北凹陷、崖城凸起、崖南低凸起和西南部陵南低凸起及南部隆起均存在中生代沉积地层。根据盆地构造演化分析，中生代沉积形成于燕山期太平洋板块向欧亚板块俯冲期以及其后的弧后伸展期，存在烃源岩、储层及圈闭等油气地质基本条件。琼东南盆地北部坳陷带崖城-崖北地区相比盆地其他地区中生代沉积凹陷规模大，因此本研究重点对琼东南盆地北部坳陷带崖城-崖北地区进行了系统的油气地质综合分析研究，落实了崖城-崖北地区中生界沉积地层分布，并初步评价预测了有利油气勘探区带及重点目标。研究表明，琼东南盆地崖城-崖北地区中生代凹陷发育湖相烃源岩、三角洲等储集体以及构造与地层圈闭，存在西洼南坡带和中部隆起带2个有利油气勘探区带。在这些区带加大勘探，有望获得中生界油气突破。
- 琼东南盆地 /
- 中生界 /
- 沉积地层 /
- 构造演化 /
- 有利油气勘探区带 /
- 崖城-崖北地区
Abstract:
Mesozoic sags of the Qiongdongnan Basin are prospective areas for oil and gas discovery. To make petroleum breakthroughs in Mesozoic sags in the Qiongdongnan Basin, it is urgent to clarify the conditions of hydrocarbon accumulation and the favorable areas for exploration in those Mesozoic sags. Based on geophysics, geochemistry, drilling and paleontology data, systematic research on Mesozoic sags in the Qiongdongnan Basin was carried out. The results show that Mesozoic sedimentary formations were distributed in the Yabei Sag, Yacheng Uplift, Yanan Uplift, Lingnan Uplift and Southern Massif in the Qiongdongnan Basin. According to the analysis of tectonic evolution, Mesozoic formations were formed in the back-arc extensional basin in the Yanshanian period with subduction of the Pacific Plate to the Eurasian Plate, which has the possibility of forming source rocks, reservoirs, and traps. Because the potential of Mesozoic sags is larger in the Yacheng-Yabei area of the northern depression than in other areas in the Qiongdongnan Basin, this paper focuses on the comprehensive study of petroleum geology in the Yacheng-Yabei area that includes the definition of the Mesozoic formation and defines the favorable area and prospects of Mesozoic rocks. This paper further notes that Mesozoic lacustrine source rocks, delta reservoirs, structural and stratigraphic traps developed in the Yacheng-Yabei area. The southern slopes of the western sag and central massif are two favorable areas for exploration. To expand exploration in these areas, we hope to make petroleum breakthroughs in Mesozoic formations.
- Qiongdongnan Basin /
- mesozoic /
- sedimentary formation /
- tectonic evolution /
- favorable area for hydrocarbon exploration /
- Yacheng-Yabei

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图 1 琼东南盆地构造区划及崖城-崖北研究区分布位置

Figure 1. Tectonic framework of the Qiongdongnan Basin and the location of the Yacheng-Yabei area

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图 2 反映琼东南盆地可能发育中生界沉积凹陷的特征剖面图

a.崖北凹陷疑似中生界沉积地层(T100-Tg); b.崖南低凸起疑似中生界沉积地层(T100-Tg); c.崖城凸起疑似中生界沉积地层(T100-Tg); d.松南低凸起疑似中生界沉积地层(T100-Tg); e.西沙隆起疑似中生界沉积地层(T100-Tg); f.中生界沉积地层特征剖面位置图

Figure 2. Profiles showing possible sedimentary sags of Mesozoic in the Qiongdongnan Basin

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图 3 崖城-崖北地区中生代沉积典型地震剖面特征(图 1中X剖面)

Figure 3. Profile showing sedimentary sag of Mesozoic in the Yacheng-Yabei area, Qiongdongnan Basin

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图 4 崖城-崖北地区新生界基底以下地震反射层速度分析剖面(图 1中Y剖面)

Figure 4. Velocity analysis of reflecting layer under the Cenozoic basement in the Yacheng-Yabei area

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图 5 琼东南盆地松南低凸起疑似晚中生代双壳化石(粗饰蛤)

Figure 5. Fossils of Mesozoic in the Songnan uplift, Qiongdongnan Basin(Ruditapes crassipes)

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图 6 X1-X3-X5井钻井地层沉积相剖面

Figure 6. Profile of sedimentary facies through wells X1, X3 and X5

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图 7 崖城-崖北地区中生代沉积底面深度图与地层分布特征典型剖面图

Figure 7. Depth map and representative profiles of the Mesozoic sags in the Yacheng-Yabei area

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图 8 崖城-崖北地区中生代凹陷古地貌及沉积相平面展布特征

a.崖城-崖北地区中生代凹陷古地貌恢复图; b.崖城-崖北地区中生代凹陷沉积相平面图

Figure 8. Palaeo-geomorphology and sedimentary map of Mesozoic sags in the Yacheng-Yabei area

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图 9 过崖城-崖北地区中生界三角洲储集体典型沉积相剖面

Figure 9. Representative profiles showing sedimentary facies of the Mesozoic deltas reservoir in the Yacheng-Yabei area

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图 10 X3井、X4井、X2井原油地球化学特征

Figure 10. Geochemical characteristic of crude oil from wells X3, X4 and X2

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图 11 过崖城-崖北地区中生界凹陷储盖特征示意剖面

Figure 11. Sketch section showing reservoir-seal assemblages of Mesozoic sags in the Yacheng-Yabei area

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图 12 崖城-崖北地区中生界圈闭类型及分布特征

a.底界圈闭分布图; b.顶界圈闭分布图

Figure 12. Types and distribution of Mesozoic traps in the Yacheng-Yabei area

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图 13 琼东南盆地北部崖城-崖北地区构造I油气运聚成藏概念模式

Figure 13. Sketch profile showing the accumulation pattern of prospect I in the Yacheng-Yabei area, Qiongdongnan Basin

下载: 全尺寸图片幻灯片

表 1 崖城-崖北地区中生界不同圈闭类型及展布规模基本数据

Table 1. Trapping elements of Mesozoic prospects in the Yacheng-Yabei area

区带	圈闭名称	层位	圈闭类型	圈闭面积/km²	高点埋深/m	最低圈闭线/m	闭合幅度/m
东洼东斜坡带	A	中生界顶	断块	5.6	6 400	6 500	100
	A	中生界底	地层	12.4	6 800	9 600	2 800
	B	中生界顶	断块	24.8	6 300	6 500	200
	B	中生界底	地层	39.3	6 600	9 400	2 800
	C	中生界顶	断背斜	78.2	5 900	6 300	400
	C	中生界底	地层	25.6	6 000	9 200	3 200
	D	中生界底	地层	20.0	6 800	9 000	2 200
	E	中生界顶	断背斜	20.6	6 000	6 200	200
	E	中生界底	地层	53.1	6 000	9 000	3 000
中部隆起带	G	中生界顶	断鼻	27.2	4 600	4 900	300
	G	中生界底	断背斜	14.8	5 400	5 800	400
	H	中生界顶	断鼻	35.5	4 900	5 600	700
	H	中生界底	断算	20.9	5 400	5 800	400
	F	中生界底	断背斜	80.3	6 200	7 400	1 200
西洼南斜坡带	I	中生界顶	断背斜	96.0	4 700	5 600	900
西洼南斜坡带	I	中生界底	断块	14.3	5 800	6 600	800

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