| 碎屑岩层的分层去压实校正方法 |
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| 引用本文： | 杨桥, 漆家福. 碎屑岩层的分层去压实校正方法[J]. 石油实验地质, 2003, 25(2): 206-210. doi: 10.11781/sysydz200302206 |
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| 作者姓名： | 杨桥 漆家福 |
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| 作者单位： | 石油大学 石油天然气成藏机理实验室, 北京 102200 |
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| 基金项目： | 国家自然科学基金资助项目(49872068,40242016). |
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| 摘 要： | 由于同一探井或同一地区中的不同层段的碎屑岩层在岩性和埋藏的动力学过程等方面存在差异,根据观测数据建立的统一的孔隙度-深度函数并不能真实地反映出各岩层的压实历史。同种类的沉积岩石的初始孔隙度值可能相差不大,它们主要受碎屑颗粒大小和沉积相影响,但是其压实过程可能会存在较大的差异。为了提高碎屑岩层去压实校正的精度,该文提出一种分层去压实校正方法。首先,可以按岩性和地层时代等划分"地层压实单元",然后,分别建立各"地层压实单元"的孔隙度-深度函数。不同的"地层压实单元"可以分别采用能反映它们的压实过程的压实模型,并通过实验方法确定各"地层压实单元"的初始孔隙度。在此基础上再根据"地层骨架厚度不变"原理进行去压实校正。
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| 关 键 词： | 碎屑岩层 地层压实单元 初始孔隙度 去压实校正 |
| 文章编号： | 1001-6112(2003)02-0206-05 |
| 收稿时间： | 2002-02-20 |
| 修稿时间： | 2002-02-20 |
METHOD OF DELAMINATED DECOMPACTION CORRECTION |
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| YANG Qiao, QI Jia-fu. METHOD OF DELAMINATED DECOMPACTION CORRECTION[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2003, 25(2): 206-210. doi: 10.11781/sysydz200302206 |
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| Authors: | YANG Qiao QI Jia-fu |
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| Affiliation: | Lab of Hydrocarbon Accumulation, Petroleum University, Beijing 102200, China |
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| Abstract: | The uniform porosity depth function drawing up on observed data does not express the compaction history of beds because different clastic beds are different in lithology and compaction process in a well or an identical region.The original porosity lied on clastic size and lithofacies so that the original porosity of a sort clastic bed can be considered as the same,but the compaction process could be different from each other.For the sake of reliability of decompaction correction,this paper provides a method of delaminated decompaction correction.First,beds in a well or an identical region are delaminated into some "compaction unit beds" based on their lithology,age,compaction process and so on.Then,the respective porosity depth function which expresses each delaminated "compaction unit bed" needs to be found.The original porosity in the porosity depth function could be determined by modeling sediments.The "compaction model" of delaminated "compaction unit bed" in a well or an identical region could be different or same but it should be reasonable to express their compaction process.And last,using the back strip method computes the paleao thickness and original thickness based on "conversation law of solid thickness of beds". |
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| Keywords: | clastic bed compaction unit bed original porosity decompaction correction |
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