苏北盆地溱潼凹陷沙垛1井侵入岩岩石学特征及其储集性与含油性研究

夏祥; 马晓东; 胡文瑄; 臧素华

doi:10.11781/sysydz202401087

苏北盆地溱潼凹陷沙垛1井侵入岩岩石学特征及其储集性与含油性研究

doi: 10.11781/sysydz202401087

1.
南京大学地球科学与工程学院, 南京 210008
2.
中国石化华东油气分公司, 南京 210019

基金项目:

中国石化华东油气分公司横向项目“溱潼凹陷辉绿岩形成期次与储集性研究” 34600000-21-ZC0699-0003

详细信息

作者简介:
夏祥(1997-), 男, 硕士生, 从事石油地质研究。E-mail: xiaxiang@smail.nju.edu.cn

中图分类号: TE122.2
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出版历程
- 收稿日期: 2023-04-07
- 修回日期: 2023-12-06
- 刊出日期: 2024-01-28

Petrological characteristics, reservoir property and oil-bearing potential of intrusive rocks in well Shaduo 1, Qintong Sag, Subei Basin

1.
School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210008, China
2.
SINOPEC East China Oil & Gas Company, Nanjing, Jiangsu 210019, China

摘要

摘要: 火成岩油气藏逐渐成为重要的油气藏类型，但火成岩储层非均质性很强，储集性能变化很大，储层成因机制研究非常薄弱，成为制约火成岩储层评价的主要瓶颈。以苏北盆地溱潼凹陷古近系阜宁组二段侵入岩为研究对象，通过系统的岩心观察、薄片鉴定、电子探针分析测试和测井解释等，剖析了溱潼凹陷沙垛1井阜二段侵入岩岩性、岩相特征、储层特征和储层发育主控因素。结果表明：该区侵入岩的岩性纵向变化显著，由多期侵入岩叠加组成，顶部为辉绿岩，中部为辉石二长岩，下部为橄榄辉长岩；孔隙发育程度不均一，辉绿岩和辉石二长岩孔隙发育程度低，而橄榄辉长岩孔隙发育程度较高；由于多期侵入作用的叠加以及热液蚀变的改造，发育了较好的储集空间。孔隙类型主要为溶蚀孔和构造裂缝，还发育收缩裂缝。影响储层物性的主要因素是岩性和热液流体活动，其中橄榄辉长岩中辉石等暗色矿物最易蚀变，溶蚀孔发育程度高；此外，区域性的断裂构造在许多致密的火成岩中产生了大量的构造裂缝，有效沟通了侵入岩储层的孔缝系统，且为后期的溶蚀作用提供了岩浆热液流动的通道。沙垛1井钻遇的侵入岩总体上含油性差，下部侵入岩层中可见零星荧光显示，上部侵入岩层中基本不含油。
- 侵入岩储层特征 /
- 含油性 /
- 阜宁组二段 /
- 溱潼凹陷 /
- 苏北盆地
Abstract: Igneous rock oil and gas reservoir has gradually become an important type of oil and gas reservoir, but the igneous rock reservoir is highly heterogeneous, the reservoir property varies greatly, and the study of reservoir genetic mechanism is unsubstantial, which has become the main bottleneck of igneous rock reservoir evaluation. Taking the intrusive rocks in the second member of Paleogene Funing Formation in the Qintong Sag, Subei Basin as the research object, through systematic core observation, thin section identification, electron probe analysis and testing and logging interpretation, the lithologic and lithofacies characteristics, reservoir characteristics and main controlling factors of reservoir development of the intrusive rocks in the second member of Funing Formation in well Shaduo 1 in the Qintong Sag were analyzed. The results show that the lithology of the intrusive rocks varies remarkably longitudinally, and the intrusive rock body is composed of multiphase intrusive rock, with diabase on the top, pyroxene monzonite in the middle and olivine gabbro at the bottom. The development of porosity varies, with diabase and pyroxene monzonite exhibiting low porosity, while olivine gabbro showing relatively higher porosity. Due to the superimposition of multiple intrusions and hydrothermal alteration, good reservoir spaces are formed, with predominant pore types being dissolution pores and structural fractures, accompanied by the development of shrinkage fractures. The main factors affecting the reservoir physical properties are lithology and hydrothermal fluid activity. Among them, dark minerals such as pyroxene in olivine gabbro are most easily altered, so dissolution pores are highly developed. Additionally, regional fault structures generate numerous structural fractures in many dense igneous rocks, effectively connecting the pore-fracture system of intrusive rock reservoir and providing channels through which magmatic hydrothermal fluids flow in the subsequent dissolution processes. Generally, the overall oil-bearing potential of the intrusive rocks encountered in well Shaduo 1 is poor. Sporadic fluorescence is observed in the lower intrusive rock layers, while the upper intrusive rock layers are essentially devoid of oil.
- intrusive rock reservoir /
- oil-bearing potential /
- second member of Funing Formation /
- Qintong Sag /
- Subei Basin
注释:

利益冲突声明/Conflict of Interests

所有作者声明不存在利益冲突。

All authors disclose no relevant conflict of interests.

作者贡献/Authors’Contributions

夏祥和胡文瑄完成论文的构思；夏祥、马晓东、胡文瑄、臧素华参与论文写作修改。所有作者阅读并同意最终稿件的提交。

The study was designed by XIAO xiang and HU Wenxuan. The manuscript was drafted and revised by XIA Xiang, MA Xiaodong, HU Wenxuan and ZANG Suhua. All the authors have read the last version of paper and consented for submission.

HTML全文

图 1 苏北盆地和研究区地质构造

a.苏北盆地构造单元；b.溱潼凹陷阜宁组二段构造单元。据参考文献[35]修改。

Figure 1. Geological sketch map of Subei Basin and the research area

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图 2 苏北盆地溱潼凹陷沙垛1井侵入岩发育情况及采样位置

Figure 2. Development and sampling location of intrusive rocks in well Shaduo 1, Qintong Sag, Subei Basin

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图 3 苏北盆地溱潼凹陷沙垛1井侵入岩不同岩石类型的岩相学特征

a.辉石二长岩岩心，新鲜呈块状构造，稍蚀变；b.橄榄辉长岩岩心，岩石晶体颗粒变大，非常破碎，蚀变程度较大；c.辉绿岩，辉绿结构，斜长石杂乱排列，斜长石格架中充填辉石，3 548.5 m，正交偏光；d.辉石二长岩，长石含量占主导，长柱状斜长石和短柱状正长石均有分布，并含有辉石，3 551.3 m，正交偏光；e.橄榄辉长岩，辉石与斜长石为主，含有较多橄榄石，裂理发育，3 589.5 m，正交偏光；f.橄榄辉长岩，收缩裂缝边缘多发生绿泥石化，3 587.8 m，单偏光。

Figure 3. Petrographic characteristics of different types of intrusive rocks in well Shaduo 1, Qintong Sag, Subei Basin

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图 4 苏北盆地溱潼凹陷沙垛1井侵入岩中长石An-Ab-Or图解和辉石Wo-En-Fs图解

Figure 4. Diagrams of An-Ab-Or of feldspar and Wo-En-Fs of pyroxene in intrusive rocks in well Shaduo 1, Qintong Sag, Subei Basin

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图 5 苏北盆地溱潼凹陷沙垛1井侵入岩主量元素变化

Figure 5. Variation of major elements of intrusive rocks in well Shaduo 1, Qintong Sag, Subei Basin

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图 6 苏北盆地溱潼凹陷沙垛1井侵入岩储集空间

a.收缩微缝，呈“树根状”不规则分布，蓝色铸体薄片，单偏光，3 590.3 m；b.收缩微缝，裂缝边缘发生溶蚀，有次生绿泥石形成，蓝色铸体薄片，单偏光，3 592 m；c.溶蚀孔隙，辉石发生溶蚀形成次生孔隙，蓝色铸体薄片，单偏光，3 598 m；d.溶蚀孔洞，辉石矿物绿泥石化(片状矿物)，扫描电镜。

Figure 6. Reservoir space of intrusive rocks in well Shaduo 1, Qintong Sag, Subei Basin

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图 7 苏北盆地溱潼凹陷沙垛1井孔隙度分布

Figure 7. Porosity distribution of intrusive rocks in well Shaduo 1, Qintong Sag, Subei Basin

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图 8 苏北盆地溱潼凹陷沙垛1井侵入岩部分测井曲线

Figure 8. Logging curves of intrusive rocks in well Shaduo 1, Qintong Sag, Subei Basin

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图 9 苏北盆地溱潼凹陷沙垛1井侵入岩不同部位荧光显微照片

a.3 943 m，不含油；b.3 592 m，荧光沿孔喉呈条状分布；c.3 595.8 m，微弱荧光沿孔喉呈条状分布；d.3 598 m，荧光呈团簇状分布。

Figure 9. Fluorescence micrographs of intrusive rocks from well Shaduo 1, Qintong Sag, Subei Basin

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表 1 苏北盆地溱潼凹陷沙垛1井长石矿物电子探针值

Table 1. Electron probe values of feldspar minerals in well Shaduo 1, Qintong Sag, Subei Basin %

样品	TiO₂	Na₂O	FeO	K₂O	MgO	MnO	CaO	Al₂O₃	SiO₂	合计
SD-6	0.10	4.00	0.90	0.30	1.90	0.10	10.60	27.10	49.43	94.30
	0.09	4.54	0.71	0.20	0.11	0.01	12.73	29.58	52.44	100.40
	0.08	3.74	0.56	0.12	0.14	0.01	14.21	30.98	50.82	100.66
SD-8	0.10	5.55	0.73	0.31	0.13	0.01	10.39	28.33	55.07	100.61
SD-8	0.06	4.80	1.09	0.25	0.15	0.01	11.89	30.07	53.89	102.20
SD-10	0.00	8.42	0.60	0.60	0.07	0.02	5.20	24.80	62.54	102.24
	0.04	8.05	0.28	0.55	0.01		6.28	25.53	61.50	102.24
	0.03	7.84	0.33	0.64	0.03		6.56	25.17	58.94	99.52
SD-12	0.05	4.06	1.05	0.16	0.03	0.01	13.50	31.41	52.00	102.27
SD-12	0.08	5.95	0.70	0.28	0.11		9.72	27.90	55.90	100.63

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表 2 苏北盆地溱潼凹陷沙垛1井辉石矿物电子探针值

Table 2. Electron probe values of pyroxene minerals in well Shaduo 1, Qintong Sag, Subei Basin %

样品	TiO₂	Na₂O	FeO	K₂O	MgO	MnO	CaO	Al₂O₃	SiO₂	合计
SD-6	1.13	0.35	11.20	0.01	8.77	3.25	22.13	2.57	48.86	98.25
	2.30	0.41	13.09	0.01	11.38	0.27	20.81	4.72	46.67	99.65
	1.30	0.36	12.41	0.01	12.13	0.27	21.52	3.01	49.81	100.81
	0.20	0.03	37.81	0.01	10.68	0.85	3.00	0.21	49.57	102.37
	2.06	0.46	12.70	0.01	11.77	0.26	20.36	4.02	46.71	98.34
	2.00	0.44	12.87	0.01	11.87	0.27	20.61	4.13	48.44	100.63
	0.08	0.03	39.30	0.03	10.05	0.74	1.92	0.09	49.60	101.84
	0.11	0.03	37.39	0.00	10.14	0.94	2.57	0.10	49.61	100.89
	0.61	0.33	15.19	0.01	11.68	0.35	20.86	1.80	52.13	102.96
SD-8	1.29	0.36	13.00	0.00	12.87	0.31	19.18	2.54	47.80	97.36
	36.87	0.23	38.41	0.31	3.86	3.29	0.27	2.95	10.41	96.60
	0.07	0.05	38.02	0.02	10.23	0.85	2.79	0.28	48.71	101.02
SD-10	0.46	0.35	16.93		10.90	0.54	20.59	0.80	51.09	101.64
SD-10	0.02	0.44	25.99	0.39	9.21	0.31	3.54	7.14	41.36	88.42
SD-12	0.92	0.36	7.07	0.00	15.73	0.15	21.21	2.98	50.82	99.24
	0.06	5.24	6.37	0.15	4.20	0.16	6.75	27.08	49.93	99.94
	0.66	0.32	6.92	0.02	15.88	0.15	20.75	3.28	50.52	98.49
	0.03	0.07	24.88		36.95	0.33	0.13	0.02	37.69	100.09
		0.05	24.93	0.03	35.03	0.35	0.27	0.04	39.63	100.32
SD-19	0.03	0.03	27.06	0.03	37.26	0.40	0.24	0.02	38.39	103.45
SD-19		8.86	3.59	0.15	3.41	0.08	0.87	20.86	66.90	104.70

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