收稿日期: 2017-11-08
修回日期: 2017-12-22
网络出版日期: 2018-05-10
基金资助
“十三五”国家科技重大专项“琼东南盆地深水区大中型气田形成条件及勘探关键技术”(编号：2016ZX05026-002)；中海石油(中国)有限公司湛江分公司自有科研项目“差异岩—场耦合的储层联控机制与有效储盖分布研究”(编号：ZYKY-2018-ZJ-01)联合资助.
Diagenesis and porosity evolution of the Huangliu Formation canyon-channel reservoir in Ledong-Lingshui Sag，Qiongdongnan Basin
Received date: 2017-11-08
Revised date: 2017-12-22
Online published: 2018-05-10
峡谷水道是琼东南盆地增储上产的重要目标，目前乐东—陵水凹陷峡谷水道探明天然气储量占全盆探明储量的70%。为揭示峡谷水道储层形成机理，利用岩石薄片、物性、扫描电镜、黏土X-射线衍射、包裹体等分析资料，研究了乐东—陵水凹陷黄流组峡谷水道储层成岩作用与孔隙演化特征，明确不同区带成岩演化差异，确定峡谷水道成岩共生序列，建立峡谷水道孔隙演化模式。结果表明：峡谷水道储层经历了压实、胶结、溶解等多种成岩作用，现主体处于中成岩A期，成岩共生序列为早期黏土矿物析出→长石微溶蚀→石英次生加大并且长石强烈溶蚀→铁方解石、白云石胶结→石英及其次生加大边溶蚀→碳酸盐胶结物微溶，在崖城A/B区表现为“压实明显减孔，硅质—碳酸盐胶结减孔，长石、铁方解石溶蚀增孔”的演化特点，在陵水Z/X区呈“压实减孔，铁方解石胶结减孔，长英质溶蚀少量增孔”的特征。
钟 佳，尤丽，张迎朝，曲希玉，代龙，吴仕玖 . 琼东南盆地乐东—陵水凹陷黄流组峡谷水道储层成岩作用与孔隙演化[J]. 天然气地球科学, 2018 , 29(5) : 708 -718 . DOI: 10.11764/j.issn.1672-1926.2018.01.002
The canyon-channel is a kind of important target for increasing reserves in Qiongdongnan Basin.Currently，the proved gas reserves of canyon channels in Ledong-Lingshui Sag has taken up 70% of the total proved storage in whole Qiongdongnan Basin.In order to analyze formation mechanism of canyon-channel，based on rock thin section，petrophysics data，scanning electron microscope(SEM)，clay X-ray diffraction，fluid inclusion，as well as other data，the diagenesis and porosity evolution of the Huangliu Formation canyon-channel reservoir have been studied，the difference of diagenetic evolution in various areas has been ascertained，the paragenetic sequence has been confirmed，pore evolution mode for canyon-channel has been eventually built.The results show that canyon-channel sandstones have experienced compaction，cementation，dissolution，and other diagenesis processes，and now are in mesodiagenesis A stage.The diagenetic sequence was：early clay mineral precipitation；feldspar microdissolution；quartz overgrowth and feldspar intense dissolution；ferrocalcite and dolomite cementation；quartz and quartz overgrowth dissolution；microdissolution of carbonate cement.Besides，the porosity evolution in Yacheng A/B area displays characteristics of “obvious porosity reduction via compaction；porosity reduction via sillceous and carbonate cement，porosity increase via dissolution of feldspar and ferrocalcite” and the porosity evolution in Lingshui Z/X area shows the features of “porosity reduction via compaction；porosity reduction via ferrocalcite cementation；slight porosity increase via dissolution of felsic”.
Key words： Ledong-Lingshui Sag; Canyon channel; Reservoir; Diagenesis; Porosity evolution
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