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时间:2020-05-03
《四川盆地中二叠统热水白云岩成因及其分布-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第34卷第9期地质勘探·25·四川盆地中二叠统热水白云岩成因及其分布汪华沈浩黄东石学文李毅袁小玲杨雨然中国石油西南油气田公司勘探开发研究院汪华等.四川盆地中二叠统热水自云岩成因及其分布.天然气工业,2014,34(9):2532.摘要四川盆地油气勘探过程中,在钻揭中二叠统时常发现厚度不等的自云岩储层,但过去对该套储层的特征、成因机制、分布规律等认识不一致,制约了其勘探进程。为此,在系统分析川东地区该套白云岩储层的岩性特征和储集空间类型,以及基底断裂对中二叠统沉积影响的基础上,初步落实了该区中二叠统茅
2、口组茅二a亚段自云岩储层的平面分布范围;进而探讨了白云岩储层的成因机制,并提出了热次盆、热次盆沉积微相的概念。结论认为:①茅二a亚段层状白云岩储层厚度可达30m,以细中晶、硅质白云岩为主,其溶蚀孔洞、裂缝发育,储集性能好;②地球化学特征分析结果表明,茅二a亚段白云岩为热水成因沉积(非正常海水水成沉积),基底断裂控制了该套自云岩储层的平面展布;③过去认为该区W67、W83、W93等3口井因钻遇特大裂缝系统从而造就了石灰岩储层高产,而此次研究则证实,这3口井均属同一压力系统,高产原因在于其储层均为茅二a
3、亚段自云岩储层;④热次盆沉积微相为川东地区茅v1组最有利的储集相带,勘探工作应围绕这一沉积微相的分布范围展开。关键词四川盆地川东地区中二叠世白云岩储集层硅质白云岩热水成因热次盆微相有利储集相带D0I:10.3787/i.issn.1000—0976.2O14.09.004OriginanddistributionofhydrothermaldolomitesoftheMiddlePermianintheSichuanBasinWangHua,ShenHao,HuangDong,ShiXuewen,L
4、iYi,YuanXiaoling,YangYuran(ExplorationandDevelopmentResearchInstituteofPetroChinaSouthwestOil&G口eldCompany,Chengdu,Sichuan610051,China)NATUR.GASIND.VOLUME34,ISSUE9,pp.25—32,9/25/2014.(ISSN1000~0976;InChinese)Abstract:Dolomitereservoirswithvariousthickn
5、essesareoftenencounteredduringdrillingthroughthePermianstrataintheSi—chuanBasin.However,noconsensushaseverbeenreachedontheircharacteristics,geneticmechanismsanddistributionrules,whichimpedestheexplorationprocess.ThedolomitereservoirsintheP2Ⅲ。a(theinter
6、val“3’’ofthe2memberoftheMiddlePer—mianMaokouFm)weremappedbasedonthesystematicanalysisofthelithologicfeaturesandreservoirspacetypesofthedolomitereservoirsaswellastheimpactsofbasementfaultsonthedepositionofthePermianstrataineasternSichuanBasin.Moreover,t
7、hegeneticmechanismsofthedolomitereservoirswereanalyzedandtheconceptsofahydrothermalsub—。basinandsedimentarymicrofa—_cieswithinahydrothermalsub—basinwerepresented.Thefollowingconclusionswereobtained.(1)ThelayereddolomitereservoirinP2mawiththethicknessof
8、upto30misdominatedbyfine—intermediatecrystallinesiliceousdolomiteswithwell—developeddissolu—tionporesandcavitiesaswellasfractures。andthushasgoodporopermcharacteristics.(2)Geochemicalanalysisrevealsthatthedominateddolomitesthereareofhydr
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