COVER TYPES AND THEIR CONTROL OVER HYDROCARBON MIGRATION AND ACCUMULATION

Zheng Chaoyang; Zhang Wenda; Zhu Panliang

doi:10.11743/ogg19960202

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COVER TYPES AND THEIR CONTROL OVER HYDROCARBON MIGRATION AND ACCUMULATION
Vol. 17, Issue 2, Pages: 96-101(1996)
Online First：25 June 1996，

Published：1996
DOI： 10.11743/ogg19960202
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DOI：

Zheng Chaoyang, Zhang Wenda, Zhu Panliang. COVER TYPES AND THEIR CONTROL OVER HYDROCARBON MIGRATION AND ACCUMULATION[J]. 1996, 17(2): 96-101. DOI： 10.11743/ogg19960202.

摘要

根据盖层封盖机理与岩石孔隙结构的关系

把盖层分为微孔型和微缝型两类。微孔型盖层饱压比值曲线呈单峰态

峰值他压比大于3.0×10

-2

MPa

-1

多位于中浅层(源岩生油窗之上)

不仅构成油气的直接盖层

而且与流体高能面配合

能形成高效的区域盖层。微缝型盖层由微孔型盖层演化而来

饱压比值曲线具多峰态

峰值他压比小于3.0×10

-2

MPa

-1

多位于中深层(源岩生油窗之下)

主要起直接盖层作用

作为区域盖层则效率较低。

Abstract

Based on the relationship between sealing mechanism and rock pore texture

the covering strata can be diyided into micro-pore type and micro-fracture type. The former has monopeak saturation-pressure ratio curve and the peak saturation-pressure ratio is greater than 3. 0?10

-2

MPa

-1

: the later has multi-peak curves of saturation-pressure ratio

the peak saturation-pressure ratio is less than 3. 0?10

-2

MPa

-1

. The micro-fracture cover beds are the evolution result of micro-pore cover beds

and are mainly buried in mid-deep depth (below oilwindow) : the micro-pore cover beds are mainly distributed shallower (above oil-window). The micro-pore type could not only be the direct cover bed of hydrocarbon

but also could form high quality regional covering strata in association with high energy fluid surface: the micro-fracture type could only be the direct cover bed.