从含油气检测来洞悉琼东南盆地东部发育始新统烃源岩的可能性

刘妍鷨; 陈红汉; 苏奥; 翟普强; 熊万林; 孔令涛

doi:10.3799/dqkx.2016.521

从含油气检测来洞悉琼东南盆地东部发育始新统烃源岩的可能性

doi: 10.3799/dqkx.2016.521

1.
中国地质大学构造与油气资源教育部重点实验室，湖北武汉 430074
2.
中海石油(中国)有限公司深圳分公司，广东广州 510240

基金项目:

国家自然科学基金项目 41572118

国家“十二五”重大科技专项 2011ZX05023-004-010

详细信息

作者简介:
刘妍鷨(1989-)，女，博士，研究方向为含烃流体地质.E-mail:liuyanhua530@yahoo.com

通讯作者:
陈红汉，E-mail: hhchen@cug.edu.cn

中图分类号: P618.13
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- 被引次数: 0
出版历程
- 收稿日期: 2015-12-08
- 刊出日期: 2016-09-15

Eocene Source Rock Determination in Qiongdongnan Basin, the South China Sea:A Hydrocarbon Detection Perspective

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Shenzhen Branch of CNOOC (China) Ltd., Guangzhou 510240, China

摘要

摘要: 目前普遍认为琼东南盆地天然气来源于渐新统和中新统海相煤型烃源岩，对于始新统偏Ⅰ型干酪根烃源岩的存在尚不明确，因此确定始新统烃源岩生烃可能性及其分布将为下一步勘探提供重要依据.琼东南盆地东部45块样品的流体包裹体系统测试分析以及天然气和轻烃地球化学特征分析结果表明，盆地东部气藏以油型气及油型-煤型混合气为特征，至少有4期天然气充注，其中第1期天然气充注与始新统烃源岩生排烃有关.由此认为，琼东南盆地东部可能发育始新统偏Ⅰ型干酪根烃源岩，主要分布于松南-宝岛-长昌凹陷以及北礁凹陷.
- 始新统 /
- 烃源岩 /
- 流体包裹体 /
- 天然气 /
- 琼东南盆地 /
- 油气 /
- 地球化学
Abstract: It is generally held that most gas in Qiongdongnan basin, the South China Sea, is coal type gas and comes from the Oligocene and Miocene marine source rocks, while the existence of Eocene source rocks is uncertain. Determining Eocene source rocks will provide significant foundation for oil and gas exploration. The systematical analysis of fluid inclusions of 45 samples and geochemical characteristics of gas and light hydrocarbons indicate that most of the gas is oil type gas and oil-coal gas with 4 gas charging episodes. The first gas charging episode probably comes from Eocene source rocks in eastern of Qiongdongnan basin, the South China Sea. The results indicate that it probably develops kerogen type Ⅰ of Eocene source, distributed in Songnan-Baodao-Changchang depression and Beijiao depression of Qiongdongnan basin, the South China Sea, which can be regarded as advantage exploration targets.
- Eocene /
- source rock /
- fluid inclusion /
- natural gas /
- Qiongdongnan basin /
- hydrocarbons /
- geochemistry

HTML全文

图 1 琼东南盆地构造区划与始新统沉积中心分布

据雷超等(2011)和廖计华等(2012)修改

Fig. 1. Structural units division and depocenters distribution plan of Eocene (left) and geological column (right) in Qiongdongnan basin, South China Sea

下载: 全尺寸图片幻灯片

图 2 琼东南盆地东部天然气和原油中的C₇轻烃系列三角图

ΣDMCP.二甲基环戊烷；MCH.甲基环己烷；nG₇.正庚烷

Fig. 2. Ternary diagram for C₇ light hydrocarbon system from crude oil and natural gas in east of Qiongdongnan basin

下载: 全尺寸图片幻灯片

图 3 δ¹³C₁-δ¹³C₂不同成因的有机烷烃气鉴别

Ⅰ.煤型气区；Ⅱ.油型气区；Ⅲ.碳同位素系列倒转混合气区；Ⅳ.煤型气和油型气区；Ⅴ.煤型气、油型气和混合气区；Ⅵ.生物气和混合气区

Fig. 3. The cross-plot of δ¹³C₁ (‰PDB) and δ¹³C₂ (‰PDB) to identify hydrocarbon gas origin in east of Qiongdongnan basin

下载: 全尺寸图片幻灯片

图 4 琼东南盆地东部部分已钻井油及砂岩抽提物甾萜烷特征对比

Fig. 4. Comparative characteristics of sterane and terpane biomarkers in east of Qiongdongnan basin

下载: 全尺寸图片幻灯片

图 5 琼东南盆地东部部分流体包裹体显微荧光特征

井号YING9，层位E₁l¹，深度2 221.97 m，灰白色细砂岩，穿石英颗粒裂纹中见不发荧光的的纯气相包裹体.a.透射光照片；b.为荧光照片

Fig. 5. Photomicrographs of fluid inclusions in east of Qiongdongnan basin

下载: 全尺寸图片幻灯片

图 6 埋藏史及油气充注年龄

a.BD20-1-1井；b.ST24-1-1井

Fig. 6. The burial history and hydrocarbon charging ages determination of well BD20-1-1 and well ST24-1-1

下载: 全尺寸图片幻灯片

图 7 琼东南盆地东部天然气成藏期次和成藏时间

Fig. 7. Gas accumulation stages and reservoirring periods of wells in east of Qiongdongnan basin

下载: 全尺寸图片幻灯片

图 8 琼东南盆地始新统沉积时期古地貌恢复

据廖计华等(2012)

Fig. 8. Palaeogeomorphology recovery map in Eocene of Qiongdongnan basin

下载: 全尺寸图片幻灯片

图 9 琼东南盆地松南凹陷、北礁凹陷地震层序地层划分及沉积相解释剖面

剖面AA′位置见图 1

Fig. 9. Seismic stratigraphic sequences classification and lateral section explanation of precipitation facies in Songnan sag and Beijiao sag of Qiongdongnan basin

下载: 全尺寸图片幻灯片

表 1 与纯气相包裹体共的生盐水包裹体平均均一温度

Table 1. Homogenous temperatures of oil inclusions and their coeval aqueous inclusions in east of Qiongdongnan basin

井号	样品编号	深度(m)	层位	与气同期盐水/含烃盐水包裹体均一温度(℃)
井号	样品编号	深度(m)	层位	Th₁	Th₂	Th₃	Th₄	Th₅	Th₆
BD13-1-1	B127	1 578.55	N₁m²	82.2
BD13-1-1	B126	1 700.06	N₁s¹	87.2
BD13-3-1	B165	1 751.00	N₁m²	87.9
BD13-3-1	B166	1 920.00	N₁s¹	98.5
BD13-3s-1	B135	1 884.00	N₁m²		113.7~114.7
BD13-3s-1	B124	1 968.70	N₁s¹		116.3~118.7
BD13-3s-1	B123	1 977.66	N₁s¹	90.9
ST24-1-1	B082	1 870.00	N₁m¹	89.6
ST24-1-1	B081	2 280.00	N₁s¹		119.2
ST24-1-1	B079	2 662.00	N₁s²		119.7		146.2
ST24-1-1	B080	2 770.00	E₃l¹		122.2
ST24-1-1	B085	3 210.00	E₃l²		118.6	139.1
ST24-1-1	B083	3 760.00	E₃y¹			133.5
BD19-2-1	B162	2 330.00	N₁m¹				147.4
BD19-2-1	B160	2 680.00	N₁s¹		116.6
BD19-2-2	B045	2 826.00	N₁s¹		123.1
BD19-2-2	B046	2 986.00	N₁s²		126.6
BD19-2-3	B167	2 378.00	N₁m²		115.9	133.2
BD19-2-3	B138	2 422.00	N₁s¹		119.8	133.8
BD19-2-3	B141	2 429.68	N₁s¹		111.7	137.6
BD19-2-3	B168	2 600.00	N₁s¹		116.0
BD19-2-3	B169	2 898.00	N₁s²		125.6
BD19-2-3	B170	3 150.00	N₁s²				146.7
BD19-2-3	B172	3 610.00	E₃l¹				147.1
BD19-2-3	B173	3 770.00	E₃l²		129.9			164.9
BD19-2-3	B142	3 937.00	E₃l²		117.3			172.4
BD19-2-3	B145	5 040.00	E₃l³					167.6	199.1
BD19-4-1	B186	2 824.00	N₁s¹		121.9
BD19-4-1	B187	3 198.00	N₁s²			136.2		164.3~166.0
BD20-1-1	B184	2 430.00	N₁s¹		116.8		148.9
BD20-1-1	B183	2 940.00	N₁s²		115.8~118.7		146.7~156.3
BD20-1-1	B181	3 132.00	E₃l¹			133.9	158.0
BD20-1-1	B180	3 490.00	E₃l²				154.4
BD20-1-1	B176	3 964.00	E₃l³		120.5	132.2	153.3
BD20-1-1	B175	4 258.00	E₃y¹					170.3	182.8
ST29-2-1	B117	3 125.00	N₁s²		127.6	139.5
ST29-2-1	B119	3 714.00	E₃l¹			136.2	149.5	161.0
ST29-2-1	B121	4 214.00	E₃l²				156.7
ST36-1-1	B071	4 378.00	N₁s²				152.8~157.6
ST31-2-1	B057	1 025.00	N₁s¹	93.4
ST31-2-1	B054	2 045.00	E₃l²	103.6
ST31-2-1	B052	2 804.00	E₃l³		117.5~117.7
ST31-2-1	B051	3 380.00	E₃y¹	107.2	121.7
YIN9	B037	2 221.97	E₃l¹	105.7~108.1	126.9
YIN9	B040	2 455.00	E₃l²		118.5	138.7
YIN9	B038	2 690.90	E₃l³		116.6

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