摘要
选取我国页岩油气最具勘探前景的四川盆地志留系龙马溪组（S1l）和寒武系筇竹寺组（∈1q）海相页岩、渤海湾盆地始新统沙河街组（E2s）湖相页岩与北美已商业开发的页岩气地层进行地质类比,分析其在发育层位、岩石组构、有机质演化程度、孔隙结构等方面的差异性。北美地区Barnett页岩热演化程度适中,镜质体反射率Ro为1%~1.3%,总有机碳质量分数w（TOC）为1%~13%,有机质以Ⅱ型干酪根为主,埋藏深度较浅,有机质粒内孔发育;S1l烃源岩w（TOC）为0.5%~4%,有机质以Ⅰ-Ⅱ1型干酪根为主,Ro为2.5%~3.6%,主要发育晶间孔、粒内孔;∈1q烃源岩w（TOC）为0.35%~22.15%,有机质以Ⅰ-Ⅱ1型干酪根为主,Ro为1.28%~5.2%,主要发育晶间孔、粒间孔和溶蚀孔;E2s烃源岩w（TOC）为0.6%~8.0%,有机质以Ⅰ型干酪根为主,Ro为0.5%~1.2%,主要发育粒内孔、粒间孔。E2s烃源岩热演化程度低,以页岩油为主,开发难度大;S1l烃源岩与北美页岩气层相似点较多,可借鉴其成功的勘探开发方法,但应充分注意在地质、开发条件方面的细微差别。该研究成果对我国页岩油气勘探开发具有一定的指导意义。
The marine shales in Silurian Longmaxi Formation,Cambrian Qiongzhusi Formation in Sichuan Basin and lacustrine shales in Eocene Shahejie Formation of Bohai Bay Basin were selected for geological correlation with commercial shale gas reservoirs in North America.And then their differences in development layers,rock fabric,types and maturity of organic matter,pore structure and so on were analyzed.Barnett shale in North America was medium degree of thermal evolution with Ro 1%~1.3%,w(TOC)1%~13%,typeⅡ-kerogen was dominated,its burial was shallow and organic-matter intraparticle pores were more developed;Longmaxi Formation shale in Sichuan Basin(China)contained 0.5%to 4% of w(TOC),typeⅠ-Ⅱ1 kerogen was dominated,Ro was 2.5%~3.6%and dominated by the intercrystalline and intragranular pores;Qiongzhusi Formation shale contained 0.35%to 22.15%of w(TOC),typeⅠ-Ⅱ1 kerogen was dominated,Ro was 1.28%~5.2%and the intercrystalline,inter-grain and dissolution pores were dominated;Eocene Shahejie Formation shale in Bohai Bay Basin contained 0.6%to 8.0%of w(TOC),type I kerogen was dominated,Ro was 0.5%~1.2%and the intragranular and inter-grain pores were dominated.Eocene Shahejie Formation shale in Bohai Bay Basin was lower thermal evolution degree,the shale oil was dominated and it was difficult for exploitation;but shale in Silurian Longmaxi Formation had more similarities to shale gas reserviurs in North America.Its application method of success in exploration and development can be introduced,but full attention should be paid to subtle differences in terms of geology and development conditions,and it provides guidance for shale oil and gas exploration and development in our country.
出处
《石油天然气学报》
CAS
CSCD
2013年第9期29-33,58,共6页
Journal of Oil and Gas Technology
基金
国家自然科学基金项目(41202110)
国家科技重大专项(2011ZX05031-003-006HZ)
西南石油大学校级科技基金项目(2012XJZ004)
关键词
页岩气
岩石组构
孔隙结构
有机碳
成熟度
北美地区
shale gas
rock fabric
pore structure
organic carbon
degree of maturity
North America
