大气水在碎屑岩次生孔隙形成中的作用——以鄂尔多斯盆地三叠系延长组为例

黄思静; 武文慧; 刘洁; 沈立成; 黄成刚

大气水在碎屑岩次生孔隙形成中的作用——以鄂尔多斯盆地三叠系延长组为例

成都理工大学油气藏地质及开发工程国家重点实验室, 四川成都 610059

基金项目: 西南石油学院油气藏地质及开发工程国家重点实验室项目

详细信息

作者简介:
黄思静(1949-), 男, 教授, 1982年毕业于武汉地质学院沉积岩石学专业, 获理学硕士学位, 现主要从事沉积学和石油地质学的教学与科研工作

中图分类号: P618.130
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出版历程
- 收稿日期: 2003-04-18
- 刊出日期: 2003-07-25

Generation of Secondary Porosity by Meteoric Water during Time of Subaerial Exposure: An Example from Yanchang Formation Sandstone of Triassic of Ordos Basin

State Key Laboratory of Oil/Gas Reservoir Geology and E xploitation, Chengdu University of Technology, Chengdu 610059, China

摘要

摘要: 鄂尔多斯盆地三叠系延长组砂岩储层分布于印支期不整合面之下, 次生孔隙是最主要的石油储集空间.在大量薄片研究及资料统计的基础上, 从岩石物性、长石溶蚀形成的次生孔隙、高岭石和长石含量纵向变化等证据出发, 认为延长组砂岩储层次生孔隙的形成机制与印支期暴露时间间隔中大气水的溶解作用有关, 而不是埋藏成岩过程中有机酸溶解作用的结果, 同时人们也应对鄂尔多斯盆地延长组碎屑岩储层质量预测模式作必要更改.
- 鄂尔多斯盆地 /
- 三叠系延长组 /
- 碎屑岩储层 /
- 次生孔隙 /
- 大气淡水
Abstract: Secondary porosity is the most important reservoir space in the sandstone. The authors present an example of leaching by meteoric water in the Yanchang Formation sandstone of Triassic of Ordos basin. The interpretation is based on the information of detailed research of thin sections and a lot of statistical data. Yanchang Formation sandstone lies beneath the unconformity at the base of the Jurassic section. Subsequent detailed petrographic study has confirmed that the potassium depletion has brought about potassium feldspar dissolution, resulting in precipitation of kaolinite and creation of secondary porosity. The evidence strongly suggests the subaerial exposure of the Yanchang Formation sandstone in Early Jurassic and consequent freshwater leaching of the Yanchang Formation sandstone and generation of the secondary porosity. So secondary porosity of Yanchang Formation sandstone is not formed by the dissolution of organic acid during the time of burying diagenesis. The prediction model of reservoir quality should be modified by means of the new mechanisms of generation of secondary porosity.
- Ordos basin /
- Yanchang Formation of Triassic /
- clastic reservoir /
- secondary porosity /
- meteoric water

HTML全文

图 1 鄂尔多斯盆地三叠系延长组砂岩碎屑成分三角投点(2 989个砂岩薄片鉴定结果)^[13]

Fig. 1. Plot of w (Q), w (F), w (R) for 2 989 sandstone samples from analysis results of thin sections in Yanchang Formation of Triassic, Ordos basin

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图 2 鄂尔多斯盆地三叠系延长组储层砂岩孔隙的构成方式

(2 353个砂岩铸体薄片的分析统计结果)

Fig. 2. Histogram for porosity constitution of sandstone reservoir by 2 353 impregnated thin sections in Yanchang Formation of Triassic, Ordos basin

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图 3 鄂尔多斯盆地三叠系延长组主要储层段(长2-长8) 孔隙度(a) 和渗透率(b) 的纵向变化趋势(平均值指各油层组的平均值, 样品总数为59 023个)

Fig. 3. Vertical evolution trend of porosity (a) and permeability (b) of Yanchang Formation (Chang 2—Chang 8) of Triassic, Ordos basin (59 023 samples)

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图 4 鄂尔多斯盆地三叠系延长组主要储层段(长2-长8) 长石溶蚀孔隙(a)、次生孔隙(b) 和自生高岭石含量(c) 的纵向变化趋势(2 353个铸体薄片孔隙分类及薄片分析统计结果)

Fig. 4. Vertical evolution trend of porosity by feldspar dissolution (a), secondary porosity (b) and content of authigenic kaolinite (c) of Yanchang Formation (Chang 2—Chang 8) of Triassic, Ordos basin

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图 5 鄂尔多斯盆地P井延长组砂岩长石含量、自生高岭石含量及面孔率、长石溶蚀次生孔隙的纵向变化特征

Fig. 5. Vertical evolution characteristics of content of authigenic kaolinite and feldspar, and thin section porosity and secondary porosity by feldspar dissolution of Yanchang Formation sandstone in Well P, Ordos basin

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图 6 长2段次生孔隙被溶长石的轮廓和被溶解长石残余

铸体薄片, 茜素红、铁氰化钾混合溶液染色, 单偏光, 对角线长1.75 mm

Fig. 6. Secondary porosity by feldspar dissolution of Chang 2 member

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表 1 鄂尔多斯盆地三叠系延长组地层的划分

Table 1. Stratigraphic classification of Triassic, Ordos basin

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