鄂尔多斯盆地延长组储层胶结物形成机理及地质意义

doi:10.3969/j.issn.1673-8926.2014.02.016

Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (2): 102-107.doi: 10.3969/j.issn.1673-8926.2014.02.016

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Formation mechanism of reservoir cement of Yanchang Formation in Ordos Basin and its geological significance

QI Yalin^1，2， YIN Peng^1，2， ZHANG Dongyang³， LI Jihong^1，2， LU Wei⁴， BAI Chang’e ^1，2

1. Research Institute of Exploration and Development， PetroChina Changqing Oilfield Company， Xi’an 710018， China； 2. National Engineering Laboratory for Exploration and Development of Low-permeability Oil and Gas Fields， Xi’an 710018， China； 3. Department of Exploration， PetroChina Changqing Oilfield Company， Xi’an 710018， China； 4. Changing Industrial Group， PetroChina Changqing Oilfield Company， Xi’an 710018， China

Online:2014-04-06 Published:2014-04-06

Abstract

Abstract:

The reservoir of Triassic Yanchang Formation in Ordos Basin generally is characterized by complex composition, low maturity and roundness of rocks and poor physical properties, and belongs to typical ultra-low porosity and low permeability reservoir. Strong cementation and compaction are the main controlling factors for reservoir densing. X-ray diffraction, scanning electron microscopy and polarizing microscope were applied to analyze the distribution, assemblage types and occurrence of cements. Based on the study of modern lake sedimentology, the relationship between deposition and formation fluid composition and clay, carbonate and siliceous cements was discussed. The results show that the sedimentary fluid controls the distribution of detrital clay minerals in the lake basin, controls the conversion from detrital clay minerals to authigenic clay minerals, and controls the formation and distribution carbonate cements. Formation fluid chemical composition provides material basis and specific diagenetic environment for the cementation. This study provides the basis for the qualitative-semiquantitative prediction of favorable diagenetic facies.

Key words: rift basin, steep slope, gravity flow, reservoir properties, hydrocarbon accumulation, Dongying Sag

QI Yalin， YIN Peng， ZHANG Dongyang， LI Jihong， LU Wei， BAI Chang’e. Formation mechanism of reservoir cement of Yanchang Formation in Ordos Basin and its geological significance[J].Lithologic Reservoirs, 2014, 26(2): 102-107.

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