摘要
成岩相是一种根据其独特的、可观测的成岩组构特征予以识别和定义的岩石单位。成岩岩相分析以储集体为基本单元，通过对成岩岩相的识别和描述、成岩岩相序列分析及各种成岩岩相分布图的编制，从微观到宏观、从纵向到平面对成岩非均质性进行评价。对泌阳凹陷东部核三下亚段砂岩储集展的成岩老相及成岩非均质性进行研究，共识别出了四种主要成岩岩相及两大类七小类成岩岩相序列，并以此砂体为例对成岩岩相的平面分布及非质性进行了评价。
Diagenetic heterogeneity is very important for petroleum production, but it is often difficult to be characterized. This papergives a whole new approach to diagenetic heterogeneity description and evaluation, that is, diagenetic lithofacies analysis.Inamagnetic lithofacies are rock units or bodies with specified, observable and measurable diagenetic components andtextures. Inagenetic heterogeneities of sandstones or reservoir bodies can be evaluated from microscopic to macroscopic andfrom vertical to horizontal by recognizing diagenetic lithofacies, analyzing diagenetic lithofacies sequences, and drawingdiagenetic lithofacies distribution maps, etc.. ixagenetic lithofacies and diagenetic heterogeneities of Lower He-3 Member(Paleogene) sandstone reservoirs ih East Biyang sag are analyzed. Four types of diagenetic lithofacies are recognized anddescribed: dense carbonate-cemented facies (ocF), mottled-cemented facies with patched or striped intergranular-solution-pore zones (MCF), intergranular-solution-pore developed facies (PDF) and tight compacted facies (TCF). Each type ofdiagenetic lithofacies has a variable microscopic diagenetic heterogeneity- Vertical sequences of diagenetic lithofacies can begrouped into two categories: uniform (mainly composed of a single diagenetic lithofacies), and composite (composed of two ormore types of diagenetic lithofacies), and the latter can be subdivided into three types of sequence according to the position ofDeF as follows: peripheral (ocF mainly located at the lower and/or upper part of sequences), interbedded (DCF interbeddedwith MCF and PDF, etc. ), and intercalated (ocF as irregular intercalated beds, strips or patches). Vertical permeabilitydistribution and the location of higher permeability section are different in each sequence' Horizontal diageneticheterogeneities are usually serious in the sandstones, and can be further divided into three zones: less serious, serious, andtight cemented. ln each zone, diagenetic lithofacies and sequences are different.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
1997年第5期62-66,共5页
Petroleum Exploration and Development
关键词
成岩作用
岩相分析
储集层
非均匀性
油藏
Diagenesis, Lithofacies analysis, Heterogeneity, Sandstone, Reservoir, Biyang seg
