摘要
以野外露头、岩心观察为基础,综合采用普通薄片、铸体薄片、阴极发光薄片、扫描电镜、物性分析、黏土矿物X衍射等多种测试手段对胶莱盆地莱阳组砂岩储层特征、成岩作用及孔隙演化进行了研究。研究结果表明:受物源差异影响,凹陷东部以长石砂岩为主,凹陷西部以岩屑砂岩为主,富含各种塑性岩屑,莱阳组砂岩总体以低成分成熟度、中等结构成熟度为特征。压实作用、压溶作用和胶结作用是造成砂岩储层致密的主要原因。凹陷东部以胶结作用减孔为主,压实程度较弱,碳酸盐胶结物是造成砂岩孔隙度降低的主要胶结物。凹陷西部以压实作用为主,但绿泥石薄膜胶结物的存在有利于保存部分原生孔隙。莱阳组砂岩储层原生孔隙残留较少,多以次生孔隙为主。溶蚀作用,尤其是长石的溶解作用,对改善储层物性有重要作用。次生孔隙发育带主要在K1llw、K1ls中,成岩演化达中成岩A期,溶蚀型次生孔隙成为这一阶段主要的孔隙类型,其发育带往往是有利储层发育区。
Based on outcrop/core, thin-section, cathodoluminescence, scanning electron microscope, X-ray diffractions, physical properties and carbonate contents, we studied the characteristic of petrology and diagenesis of Laiyang Formation in Laiyang sag. It shows that feldspar sandstone is mainly developed in the eastern Laiyang sag, while litharenite in the western Laiyang sag. The Laiyang Formation contains variety of plastic lithics with low compositional mature and medium textural mature. Laiyang Formation is tightly compacted, and rich in pressure solution and cementation. The characteristic of diagenesis in the eastern Laiyang sag is strong cementation, while weak compaction,and carbonate cement is the major cement which reduced the porosity. In the western Laiyang sag, the sandstone diagenesis is dominated by compaction, and the presence of pore lining chlorite cement can restrain compaction and is beneficial to preserve primary porosity. Secondary porosity is the most important reservoir space in the Laiyang Formation, physical properties of sandstone reservoirs can be improved by dissolution, especially, of feldspar during the middle period of diagenesis. Secondary pores are vertically developed in Longwangzhuang （Klllw） and Shuinan （Klls） Members, and diagenesis reaches A-period of middle diagenesis stage. Secondary porosity developed by dissolution is one of the main porosity-type of this period. These zones are the favorable reservoirs area.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2013年第2期340-350,共11页
Journal of Jilin University：Earth Science Edition
基金
国家自然科学基金项目(41272157)
国家科技重大专项项目(2011ZX05003-002
2011ZX05009-003-01)
关键词
储层
成岩作用
孔隙演化
莱阳组
莱阳凹陷
胶莱盆地
reservoirs diagenesis
pore evolution
Laiyang Formation
Laiyang sag
Jiaolai basin
