层序格架内成岩特征差异及其成因机制  

Sequence stratigraphy's control on diagenesis and its mechanisms

作　　者：韩如冰[1] 田昌炳[1] 孙海航[2] 王培俊[2] 徐怀民[3] 李维禄[3] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油塔里木油田公司,新疆库尔勒841000 [3]中国石油大学地球科学学院,北京102249

出　　处：《中国石油大学学报（自然科学版）》2017年第2期12-20,共9页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技油气专项(2011ZX05009-003)

摘　　要：综合利用各项资料,结合孔隙演化定量研究方法,对层序格架内成岩特征差异及成因机制进行研究。结果表明:层序格架内成岩特征差异包括层序界面和层序单元两个方面;层序界面对胶结作用和溶蚀作用控制较强,界面附近胶结物含量一般更高,部分层序界面附近溶蚀强度更大;层序单元方面,受层序演化控制,不同单元沉积环境、沉积物特征不同,经历相同的成岩过程后,其压实、胶结、溶蚀作用强度不同;对于压实作用,早期海侵前滨砂岩和早期高位过渡带砂岩强度较高,而晚期海侵临滨砂岩程度较弱;对于胶结作用,早期高位过渡带砂岩、早期海侵前滨砂岩、晚期海侵临滨砂岩胶结强度依次减弱;对于溶蚀作用,早期海侵前滨砂岩、晚期海侵临滨砂岩、早期高位过渡带砂岩强度依次增强。With a comprehensive use of multiple data and calculation method of porosity evolution,the mechanisms and differ-ences in diagenesis characteristics of sequence stratigraphy framew-ork were studied. The results show- that the differences in di-agenesis include sequence boundary level and sequence unit level. Sequence boundary has strong effects on cementation and dissolution. Compared wdth the sequence unit,the content of cements and degree of dissolution near sequence boundary are sig-nificantly higher. For the sequence units,the sequence framewok controls the sedimentary environment and characteristics of the sediments. After diagenesis,the strength of compaction,cementation and dissolution of each sequence unit may be differ-ent. For compaction, the sequence framework controls the characteristics of the sediments, such as grain sorting and composi-tion. The strength of compaction of early transgressive system tract （E-TST） and early high stand system tract （E-HST） is higher than late transgressive system tract （L-TST）. For cementation,the sequence framew-ork controls the geochemical charac-teristics of the pore water, the source of calcium and the distribution of feldspar, and the content of cements of E-HST, E-TST and L-TST decreased in sequence. For dissolution, the sequence framework controls the geochemical characteristics of the pore w-ater and the source of cements,and the degree of dissolution of L-TST, E-TST and E-HST increases in sequence.

关 键 词：层序 成岩作用 东河砂岩 层序界面 层序单元 

分 类 号：TE121.3[石油与天然气工程—油气勘探]