渝东北下寒武统牛蹄塘组富有机质页岩沉积与储层特征

发布时间：2018-03-28 03:33

本文选题：渝东北　切入点：牛蹄塘组　出处：《成都理工大学》2017年硕士论文

【摘要】：渝东北地区下寒武统牛蹄塘组具有良好的页岩气资源和较大的勘探潜力。通过野外调查采样、钻井岩心观察、地震数据实测以及测试分析等方法,对研究区下寒武统牛蹄塘组黑色富有机质页岩沉积与储层特征进行了研究,取得了如下成果和认识:1.厘清了渝东北地区下寒武统牛蹄塘组地层发育特征。牛蹄塘组地层主要分布在城口-巫溪一带。岩性以灰黑色、黑色炭质页岩为主,夹黄色薄-中厚层状粉砂岩。牛蹄塘组地层厚度变化范围较大,从100m到600m均有。牛蹄塘组的地层接触关系为上覆明心寺组地层,下伏震旦系灯影组地层。2.明确了渝东北地区下寒武统牛蹄塘组富有机质页岩的沉积环境。牛蹄塘组沉积环境主要为陆棚环境,从下而上由深水陆棚向浅水陆棚过渡。纵向上,岩性由下而上依次为炭质页岩、硅质页岩、炭质与粉砂质页岩互层和粉砂质页岩。横向上,总体上西北高、东南低,水体自西北向东南逐渐加深,由陆棚浅水海域向陆棚深水海域过渡。3.分析了研究区牛蹄塘组富有机质页岩的储集性能。牛蹄塘组黑色富有机质页岩主要集中在该组的下段,脆性矿物丰富,以石英、长石及黄铁矿为主,其含量占了碎屑矿物含量的41%~75%。主要发育粒内孔、粒间孔、裂缝、有机质孔、晶间孔、黏土矿物层间孔等孔隙类型。孔隙度平均为2.42%,分布在1.18%~3.24%之间。渗透率较低,分布在(0.0001~0.01)×10~(-3)μm~2之间。裂缝发育区,具有高值渗透率,孔渗相关性较差。4.圈出来研究区牛蹄塘组页岩气有利发育区。牛蹄塘组黑色富有机质页岩所含有机质类型以I型为主,有机质总体属于过成熟阶段(普遍Ro2%),厚度主要分布在40~120m之间。根据最新页岩气评价标准,从富有机质页岩厚度、有机质丰度、有机质成熟度和矿物组成等各方面分析,优选出2个下寒武统牛蹄塘组页岩气有利区,分别为:明通-高观一带、龙台-中梁一带。
[Abstract]:The Niutetang formation of Lower Cambrian in northeast Chongqing has good shale gas resources and great exploration potential. Through field investigation and sampling, drilling core observation, seismic data measurement and test analysis, etc. The depositional and reservoir characteristics of black organic matter rich shale in Niutetang formation of Lower Cambrian in the study area were studied. The results are as follows: 1. The stratigraphic development characteristics of Niutetang formation of Lower Cambrian in northeast Chongqing are clarified. The strata of Niutetang formation are mainly distributed in Chengkou-Wuxi area. The lithology of Niutetang formation is mainly gray-black and black carbonaceous shale. The formation thickness of Niulitang formation varies from 100m to 600m. The contact relation of Niutetang formation is that of the upper overlying Mingxinsi formation. The sedimentary environment of the organic shale rich in the Niulitang formation of the Lower Cambrian in the northeast of Chongqing is defined. The sedimentary environment of the Niulitang formation is mainly a shelf environment, which is transitioned from the deep shelf to the shallow water shelf from the bottom to the top. The lithology from bottom to top is carbonaceous shale, siliceous shale, carbonaceous and silty shale interbedded and silty shale. Horizontally, the northwest is high, the southeast is low, and the water body deepens gradually from northwest to southeast. From shallow water area of shelf to deep sea area of shelf. 3. The reservoir performance of organic shale rich in Niulitang formation in the study area is analyzed. The black organic matter rich shale of Niulitang formation is mainly concentrated in the lower part of the formation, which is rich in brittle minerals and is composed of quartz. Feldspar and pyrite are dominant, and their contents account for 41% of the content of clastic minerals. They mainly develop intragranular pore, intergranular pore, crack, organic pore, intergranular pore, Pore types such as interlayer pores in clay minerals. The average porosity is 2.42%, which is between 1.18% and 3.24%. The permeability is relatively low, distributed between 0.0001 (0.01) 脳 10 ~ (-3) 渭 m ~ (-2). The correlation of porosity and permeability is poor. 4. The favorable development area of shale gas in Niulitang formation is formed in the study area. The organic matter type of black organic matter rich shale in Niulitang formation is mainly type I. The organic matter belongs to the overmature stage in general (the thickness of which is mainly distributed in the range of 40 ~ 120m). According to the latest evaluation criteria of shale gas, this paper analyzes the thickness, abundance, maturity and mineral composition of organic matter shale. Two favorable areas of shale gas in Niutetang formation of Lower Cambrian are selected as follows: Mingtong-Gaoguan area, Longtai-Zhongliang area.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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