收稿日期: 2010-10-21
修回日期: 2010-12-16
网络出版日期: 2011-04-10
基金资助
“十一五”国家科技重大专项（编号：2008ZX05002-006-007HZ）资助.
Diagenesis of Sandy Conglomerate Reservoir in Northern Steep Slope of Bonan Subsag
Received date: 2010-10-21
Revised date: 2010-12-16
Online published: 2011-04-10
通过大量的铸体薄片、扫描电镜、阴极发光、粘土矿物、X-射线衍射等分析化验资料，对渤南洼陷北部陡坡带砂砾岩储层成岩作用类型、主要影响因素进行了分析，同时划分了成岩演化阶段，并在此基础上分析了成岩相类型和不同成岩相对储层质量的控制作用。研究结果表明，渤南洼陷北部陡坡带沙三下亚段和沙四段砂砾岩储层主要处于中成岩阶段A1期和中成岩阶段A2期，对应于有机质热演化的主要生油气阶段。压实作用是使储层质量变差的最主要原因，胶结作用次之，粘土矿物溶解是使储层物性变好的最主要成岩作用。研究区共发育强压实固结成岩相、晚期碳酸盐胶结成岩相、弱压实弱胶结成岩相和不稳定组分溶蚀成岩相4种类型，各类成岩相均对储层物性起一定的控制作用，现今储层特征为4种成岩相综合作用的结果。不稳定组分溶解成岩相形成了最好的储层，弱压实弱胶结成岩相储层的物性较好，强压实固结成岩相和晚期碳酸盐胶结成岩相形成的储层物性较差。
昝灵, 张枝焕, 王顺华, 冯武军, 张立生, 邢辉 . 渤南洼陷北部陡坡带砂砾岩储层成岩作用研究[J]. 天然气地球科学, 2011 , 22(2) : 299 -306 . DOI: 10.11764/j.issn.1672-1926.2011.02.299
ased on bulk analyses of casted thin section,scanning electro microscope,cathode luminescence and X radial-diffract,the types and main controlling factors of sandy conglomerate reservoir diagenesis in north steep slope of Bonan subsag were studied. The diagenetic evolution stage was divided and the controlling functions of different diagenetic facies to reservoir quality were also analysed. The results indicated that the lower Es3 and Es4 sandy conglomerate reservoirs were in the middle diagenetic phase A1 to A2,which corresponded to the main hydrocarbon generating period of organic matter. Consolidation was the key factor to make reservoir low quality,cementation the second. Clay mineral dissolution was the main diagenesis improving reservoir quality. Studied area developed four diagenetic facies of strong consolidation diagenetic facies,later carbonate cemented diagenetic facies,weak consolidation and weak cemented diagenetic facies,and unstable component corrosion diagenetic facies,of which each played certain role in controlling physical property of reservoir,and the reservoir characteristic was the combined action of four diagenetic facies. Unstable component corrosion diagenetic facies formed the best reservoir. Reservoirs controlled by weak consolidation and weak cemented diagenetic facies had good physical property. Reservoirs controlled by strong consolidation and later carbonate cemented diagenetic facies have bad physical property. Studies above are of great importance in looking for favorable reservoirs.
Key words： Bonan subsag; Sandy conglomerate reservoir; Diagenesis; Diagenetic stage.
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