CAJ | 학술논문

结合钻井、岩心、野外露头、测井等成果，从富含有机质页岩空间展布、地化特征、岩石矿物学、孔渗性特征和地质力学性质等方面，采用页岩气目标优选评价综合分析方法，对川东南涪陵地区下侏罗统大安寨页岩油气地质特征进行了综合研究，着重定量评价了有机碳含量、镜质体反射率、含气量、孔隙度、脆性矿物含量、岩石矿物成分、岩石力学参数等评价指标，初步证实该区页岩与美国Bakken页岩具有类似特征。涪陵大安寨泥页岩与灰岩、砂岩互层频繁，半深湖-深湖页岩为有机质富集的有利岩相。大安寨上亚段灰岩厚10～30 m，物性表现为低孔、特低渗特征；下亚段富有机质页岩夹薄层灰岩、砂岩，微孔缝发育，孔隙度高。页岩有机碳含量平均为1.33％，粘土矿物平均含量为51.7％～56.1％，石英平均含量为33％，现场实测平均含气量为1.66 m3/t，处于凝析油-湿气的高成熟阶段；杨氏模量为29 GPa，泊松比为0.30，有利于压裂形成网络裂缝。大安寨段中部浅湖相区岩性组合特征更有利于裂缝发育，是大安寨段页岩气勘探有利地区，评价优选出有利区面积820 km2。
결합찬정、암심、야외로두、측정등성과，종부함유궤질혈암공간전포、지화특정、암석광물학、공삼성특정화지질역학성질등방면，채용혈암기목표우선평개종합분석방법，대천동남부릉지구하주라통대안채혈암유기지질특정진행료종합연구，착중정량평개료유궤탄함량、경질체반사솔、함기량、공극도、취성광물함량、암석광물성분、암석역학삼수등평개지표，초보증실해구혈암여미국Bakken혈암구유유사특정。부릉대안채니혈암여회암、사암호층빈번，반심호-심호혈암위유궤질부집적유리암상。대안채상아단회암후10～30 m，물성표현위저공、특저삼특정；하아단부유궤질혈암협박층회암、사암，미공봉발육，공극도고。혈암유궤탄함량평균위1.33％，점토광물평균함량위51.7％～56.1％，석영평균함량위33％，현장실측평균함기량위1.66 m3/t，처우응석유-습기적고성숙계단；양씨모량위29 GPa，박송비위0.30，유리우압렬형성망락렬봉。대안채단중부천호상구암성조합특정경유리우렬봉발육，시대안채단혈암기감탐유리지구，평개우선출유리구면적820 km2。
Based on integration of drilling ,core,outcrop and logging data ,this paper comprehensively studied the geological characteristics of the Lower Jurassic Da ’ anzhai shale gas play in Fuling ,southeastern Sichuan Basin in such aspects as spatial distribution of organic-rich shales,geochemical characteristics ,mineral components,shale porosity and permeabili-ty conditions,and geomechanical properties.We quantitatively evaluated such characteristics as TOC content,Ro,gas con-tent,porosity,brittleness,mineral composition and rock mechanical parameters .We believe that the shale gas play is anal-ogy basically to Bakken shale in North America .The Da ’ anzhai mudstone-shale features in frequent interbedding with limestone and sandstone ,and the deep to semi-deep lacustrine shales are organic-rich exploration targets .The limestone in the upper Da ’ anzhai is 10-30 m thick and has low porosity and extra-low permeability .The lower Da ’ anzhai shale with interbedded thin limestone and sandstone has well-developed micro-fractures and high porosity .The shale gas play has an average TOC content of 1.33%,average clay content of 51.7%-56.1%,average quartz content of 33%and on-site measured average gas content of 1.66 cubic metre per ton , and is at high thermal maturity stage of generating gas condensate to wet gas .The Young modulus is 29 GPa and Poisson ratio is 0 .30 ,being favorable for the creation of fracture networks through hydraulic fracturing .The middle Da ’ anzhai shale of shallow lacustrine facies is more favorable for frac-ture development,thus is the favorable target.A play fairway with an area of 820 km2 is identified.