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、储集空间特征、孔渗性特征和地质力学性质等方面，对川东北元坝区块中下侏罗统页岩油气地质特征进行了综合研究。显著地质特征是：富有机质泥页岩主要发育于自流井组大安寨段和千佛崖组千一-二段，为浅湖-半深湖沉积，黑色泥页岩夹灰岩或砂岩。有机质较为发育，有机碳含量平均为1．14％，有机质类型以Ⅱ2型为主，镜质体反射率（Ro）介于1．4％～1．6％之间，均处于凝析油-湿气的成熟-高成熟阶段。总体上，中下侏罗统页岩气构造简单、稳定，断裂不发育，保存条件良好，有利于烃类形成。大安寨段湖相页岩油气总体与北美Eagle Ford页岩气特征相似。大安寨段暗色泥页岩厚40～115 m，孔隙类型丰富，发育水平缝和微裂缝，脆性矿物含量平均为52．7％，杨氏模量平均为37 GPa，泊松比平均为0．30，有利于压裂形成网络裂缝。
결합찬정、암심、야외로두、측정등성과，종부함유궤질혈암공간전포、지화특정、암석광물학、저집공간특정、공삼성특정화지질역학성질등방면，대천동북원패구괴중하주라통혈암유기지질특정진행료종합연구。현저지질특정시：부유궤질니혈암주요발육우자류정조대안채단화천불애조천일-이단，위천호-반심호침적，흑색니혈암협회암혹사암。유궤질교위발육，유궤탄함량평균위1．14％，유궤질류형이Ⅱ2형위주，경질체반사솔（Ro）개우1．4％～1．6％지간，균처우응석유-습기적성숙-고성숙계단。총체상，중하주라통혈암기구조간단、은정，단렬불발육，보존조건량호，유리우경류형성。대안채단호상혈암유기총체여북미Eagle Ford혈암기특정상사。대안채단암색니혈암후40～115 m，공극류형봉부，발육수평봉화미렬봉，취성광물함량평균위52．7％，양씨모량평균위37 GPa，박송비평균위0．30，유리우압렬형성망락렬봉。
Integrating with drillings, cores, outcrops and logging data, we made a comprehensive geologic analy-sis of the Middle-Lower Jurassic shale reservoirs in the Yuanba area of the northeastern Sichuan Basin, from the aspects such as organic-rich shale distribution, geochemical characterization, mineral composition, hydrocarbon store space property, shale porosity and permeability condition, and geomechanical nature. The organic-rich shales mainly generated from the Daanzhai member of the Ziliujing Formation to the 1st and 2nd members of the Qianfoya Formation. They are shallow to semi-deep lacustrine facies, and mainly consist of dark shales with limes and sand stones. Organic matters are rich, and of type Ⅱ2 . The average TOC content is 1. 14%. The vitrinite reflectance (Ro) ranges from 1.4% to 1.6%, indicating for the mature and high-mature stages of condensate oil and wet gas. Generally, the Middle-Lower Jurassic shales have simple and stable structure with few fractures developed, hence are favorable for hydrocarbon generation and preservation. The lacustrine facies shales in the Daanzhai member are similar to the Eagle Ford shales in the North America in general. The dark shales in the Daanzhai member are 40-115 m thick with various pore types. Horizontal and micro fractures are well-developed. The average brittle mineral content, Young’ s modulus and Poisson ratio are 52.7%, 37 GPa and 0.30, respec-tively, all contributing to the formation of fracture network.