眼球状灰岩成因及其油气地质意义

李昂; 罗开平; 李风勋; 潘文蕾; 彭金宁; 邓模; 李龙龙

doi:10.11781/sysydz202103452

眼球状灰岩成因及其油气地质意义

doi: 10.11781/sysydz202103452

李昂^{1, 2,},
罗开平²,
李风勋²,
潘文蕾²,
彭金宁²,
邓模²,
李龙龙²

1.
吉林大学地球科学学院, 长春 130061
2.
中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126

基金项目:

国家科技重大专项专题 2017ZX05005-003-002

详细信息

作者简介:
李昂(1990-), 男, 博士, 从事非常规油气地质研究。E-mail: liang2020@jlu.edu.cn

中图分类号: TE122.2
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- 被引次数: 0
出版历程
- 收稿日期: 2020-03-23
- 修回日期: 2021-04-22
- 刊出日期: 2021-05-28

Origin of eyeball-shaped limestone and its significance for petroleum geology

1.
College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China
2.
Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

摘要

摘要: 眼球状灰岩是一种形态类似眼球与眼皮结构的碳酸盐岩，在我国南方地区广泛发育。通过对国内外关于眼球状灰岩特征及成因等研究成果的大量调研与梳理，分析并论述了眼球状灰岩的岩石学特征、古沉积环境、成因及油气地质意义等。眼球状灰岩由泥晶—粉晶生屑灰岩的“眼球”与泥质灰岩或灰质泥岩的“眼皮”组成，其成因主要包括沉积作用与成岩作用2个方面。眼球状灰岩的“眼皮”为滞留深水环境下沉积的中等有机质丰度的高—过成熟烃源岩，具有良好的生烃能力。该类灰岩为一套低孔低渗的油气储层，且“眼皮”的储集性能明显优于“眼球”。裂缝可以改善眼球状灰岩的储集物性，裂缝发育的储层具有良好的油气显示。总体来看，眼球状灰岩气藏为自生自储的碳酸盐岩气藏。
- 眼球状灰岩 /
- 岩石特征 /
- 油气地质意义 /
- 碳酸盐岩 /
- 烃源岩
Abstract: Eyeball-shaped limestone is a kind of carbonate rock with a structure shaped as eyeball and eyelid, which is widely developed in south China. The petrological characteristics, paleo-sedimentary environment, origin and hydrocarbon geological significance of eyeball-shaped limestone were analyzed and discussed through a great deal of review and investigation on the characteristics and origin of domestic and abroad eyeball-shaped limestone. The eyeball-shaped limestone is composed of the "eyeball" of micrite-silty bioclastic limestone and the "eyelid" of argillaceous limestone or calcareous mudstone. Its origin mainly includes sedimentation and diagenesis. The "eyelid" of eyeball-shaped limestone is high-maturity to over-mature source rock with medium organic matter content deposited in deep water environment, which has good hydrocarbon generation potential. The eyeball-shaped limestone is also a set of low-porosity and low-permeability reservoir, and the storage performance of "eyelid" is obviously better than that of "eyeball". Fractures can improve the reservoir physical properties of eyeball-shaped limestone, and the reservoir with fractures has good oil and gas display.On the whole, the eyeball-shaped limestone gas reservoir is a self-generating and self-storing carbonate gas reservoir.
- eyeball-shaped limestone /
- rock characteristics /
- petroleum geological significance /
- carbonate rock /
- source rock

HTML全文

图 1 眼球状灰岩野外露头及薄片照片

a.杂乱分布的眼球状灰岩^[12]，四川旺苍双汇，茅口组；b.断续串珠状眼球状灰岩，重庆涪陵，茅口组；c.连续串珠状眼球状灰岩^[13]，贵州桐梓松坎，栖霞组；d.含生屑泥质灰岩“眼皮”，JY66-1井，1 316.23 m，茅口组，单偏光；e.泥晶生屑灰岩“眼球”，JY66-1井，1 338.75 m，茅口组，单偏光；f.含生屑泥质灰岩“眼皮”，JY66-1井，1 318.3 m，茅口组，单偏光

Figure 1. Field outcrops and thin sections of eyeball-shaped limestones

下载: 全尺寸图片幻灯片

图 2 眼球状灰岩暴露成因及差异压实成因示意

Figure 2. Exposure cause and differential compaction cause of eyeball-shaped limestones

下载: 全尺寸图片幻灯片

图 3 眼球状灰岩重力流成因示意

Figure 3. Gravity flow cause of eyeball-shaped limestones

下载: 全尺寸图片幻灯片

图 4 眼球状灰岩差异压溶成因和成岩分异成因示意

Figure 4. Differential pressure solution cause and diagenetic differentiation cause of eyeball-shaped limestones

下载: 全尺寸图片幻灯片

表 1 古水体氧化—还原环境判别指标^[17]

Table 1. Identification index of oxidation-reduction environment in ancient water body

古氧相	含氧量/(mL·L^-1)	V/(V+Ni)	V/Cr	Ni/Co	U/Th	DOP
厌氧、极贫氧	0~0.1	0.60~0.89	＞4.25	＞7.0	＞1.25	＞0.75
贫氧	0.1~1.0	0.46~0.60	2.00~4.25	5.0~7.0	0.75~1.25	0.45~0.75
富氧	＞1.0	＜0.46	＜2.00	＜5.0	＜0.75	＜0.45

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