摘要
东营凹陷古近系砂岩储集层物性主要受压实、碳酸盐胶结和溶蚀作用、沉积条件控制。根据铸体薄片和阴极发光薄片、扫描电镜、物性、碳酸盐含量等数据 ,分析了该区储集层物性的控制因素 ,对各因素的影响大小和程度进行较为定量的评价。结论是 :压实作用对孔隙度的影响主要表现在埋藏早期或碳酸盐胶结程度低的阶段 ,埋深每增加 10 0 0m孔隙度降低约 6.8% ;胶结作用对储集层性质影响较大 ,碳酸盐含量小于 15 %时砂岩孔隙度一般大于 2 0 % ,碳酸盐含量超过 15 %后 ,埋深每增加 10 0 0m碳酸盐胶结减孔约 3 % ;溶蚀作用对储集层性质改善很大 ,产生的次生孔隙最大可达 2 0 %。溶蚀作用在宏观上受区域构造背景控制 ,断层较发育的地区溶蚀作用较强 ,粒度中—细、分选好、杂基少的中、细粒砂岩溶蚀作用最强 ;沉积条件对物性的影响主要表现在对原生孔隙的发育程度和溶蚀、胶结等成岩作用的控制方面。图 4表 3参 2
Sandstones reservoir quality of Paleogene in the Dongying Sag is mainly controlled by compaction, carbonate cementation and dissolution and deposition environment. All controlling factors to physical characteristics of reservoirs are analyzed based on the data from analyses of mold thin section, cathodoluminescence thin section, scanning electron microscope, physical properties and carbonate contents of rocks. And the evaluation to these factors is carried out. The results show that:① The porosity decreases a lot by compaction at shallow burial depth or low diagenesis stage and the porosity decreases by 6.8% as depth increases 1000m. ②Carbonate cementation have an obvious impaction on reservoir quality. When carbonate is less than 15%, porosity in sandstones is over 20% generally. With carbonate over 15%, as depth increases 1000m, porosity will decrease about 3%. ③Dissolution plays an important role in reservoir quality. Secondary porosity from carbonate dissolution is up to 20%. However, the dissolution is mainly controlled by the regional tectonic setting and the dissolution is relative stronger nearby the faults. The sandstones with middle fine, well sorted and low matrix were subjected heavy dissolution. The controlling of sedimentation to reservoir quality is attributed to primary porosity, dissolution and cementation.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2003年第3期95-98,共4页
Petroleum Exploration and Development
基金
国家"十五"重大科技攻关项目 (2 0 0 1BA60 5A0 9)
关键词
储集层物性
控制因素
东营凹陷
reservoir quality
controlling factors
Dongying Sag
