英台地区粉砂岩内部毫米级泥膜的微变形构造及其对储层的影响
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摘要
英台地区白垩纪均质粉砂岩储层中发育大量毫米级别的黑色泥质薄层——泥膜,其厚度在0.2～3mm之间,成分主要为泥质,部分为破碎的碳屑粉末富集层。其剖面形态有三种:近直线形、锯齿形和不规则曲线形。泥膜的表面发育多种起伏不平的微变形构造,垂向规模通常在3mm以内,按照平面形态特征可分为9种:直线形、C/S形、圆形、椭圆形、竹叶形、波痕形、树枝形、网状和不规则形,部分微变形构造较为严重可以使泥膜发生穿透。泥膜主要发育在三角洲前缘的席状砂和河口坝砂体中,主要由短暂沉积间断的泥质沉降或侧向冲刷形成,而泥膜表面微变形构造的原因主要是同沉积干扰、差异压实、顺层滑脱拖拽、生物扰动和成岩收缩以及地震活动的影响等多种因素。对泥膜的成因和微变形构造进行研究将对英台地区的沉积环境和储层精细空间结构的确定具有重要意义。
There are many thin mud laminas of mm-class in the Cretaceous equal silt stone in Yingtai area, western Songliao Basin, which we call them mud-films, have a thickness between 0.2 and 3 mm, and the main component is shale while some are carbon dust layers. They are three kinds of conformation of mud-films on section: close-straight line, serrated denticle and irregular curve. There are many micro transmutation structures with the scale less than 3 mm on the surface of mud-films, we divide all the micro transmutation structures into 9 types: straight line, C/S, circle, ellipse, and leaf of bamboo, ripple mark, twig, mesh and irregular patterns. Some micro transmutation structures are too hard to be breakthrough and so the silt stone up and below the mud-film can connect each other. The origin of the mud films are mud subsidence or sideway mud erosion in may momentary sedimentary break. There are many causes of formations of the mud-films such as syndeposit interfere, differential compaction, bedding glide, bioturbation, diagenesis shrink and earthquake activities. The study on the cause of formations and micro transmutation structures of the mud-films will have an important significance for the research of sedimentary environment and the fine space structure of the reservoirs.
There are many thin mud laminas of mm-class in the Cretaceous equal silt stone in Yingtai area, western Songliao Basin, which we call them mud-films, have a thickness between 0.2 and 3 mm, and the main component is shale while some are carbon dust layers. They are three kinds of conformation of mud-films on section: close-straight line, serrated denticle and irregular curve. There are many micro transmutation structures with the scale less than 3 mm on the surface of mud-films, we divide all the micro transmutation structures into 9 types: straight line, C/S, circle, ellipse, and leaf of bamboo, ripple mark, twig, mesh and irregular patterns. Some micro transmutation structures are too hard to be breakthrough and so the silt stone up and below the mud-film can connect each other. The origin of the mud films are mud subsidence or sideway mud erosion in may momentary sedimentary break. There are many causes of formations of the mud-films such as syndeposit interfere, differential compaction, bedding glide, bioturbation, diagenesis shrink and earthquake activities. The study on the cause of formations and micro transmutation structures of the mud-films will have an important significance for the research of sedimentary environment and the fine space structure of the reservoirs.
引文
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2张金功,袁政文.泥质岩裂缝油气藏的成藏条件及资源潜力[J].石油与天然气地质,2002,12,23(4):336-338[Zhang Jinggong,Yuan Zhengwen.Formation and potential of fractured mudstone reser-voir[J].Oil&Gas Geology,2002,12,23(4):336-338]
3赵振宇,周瑶琪,马晓鸣,等.水下收缩裂隙天然实验研究中获得的新认识[J].地质论评,2007,5,53(3):306-317[Zhao Zhenyu,Zhou Yaoqi,Ma Xiaoming,et al.Some discoveries on researching sub-aqueous mud-shrinkage cracks in present muddy sediments[J].Geolog-ical Review,2007,5,53(3):306-317]
4周瑶琪,赵振宇,马晓鸣,等.水下收缩裂隙沉积模式及定量化研究[J].沉积学报,2006,24(5):672-679[Zhou Yaoqi,Zhao Zhenyu,Ma Xiaoming,et al.The sedimentary model and quantitative analysis of the subaqueous shrink-cracks[J].Acta Sedimentologica Sinica,2006,24(5):672-679]
5杜远生,韩欣.论震积作用和震积岩[J].地球科学进展,2000,15(4):389-394[Du Yuan sheng,Han Xin.Seismo-deposition and seis-mites[J].Advance in Earth Sciences,2000,15(4):389-394]
6魏垂高,张世奇,姜在兴,等.东营凹陷现河地区沙三段震积岩特征及其意义[J].沉积学报,2006,24(6):798-805[Wei Chuigao,Zhang Shiqi,Jiang Zaixing,et al.Discovery and significance of seis-mite of Silurian in MemberⅢat Shahejie Formation in Xianhe area of Dongying Sag[J].Acta Sedimentologica Sinica,2006,24(6):798-805]
7袁静,陈鑫,田洪水.济阳坳陷古近纪软沉积变形层中的环状层理及成因[J].沉积学报,2006,10,24(5):666-671[Yuan Jing,Chen Xin,Tian Hongshui.Formation of loop bedding in Jiyang Sub-basin,Paleogene[J].Acta Sedimentologica Sinica,2006.10,24(5):666-671]
8夏青松,田景春.鄂尔多斯盆地南部上三叠统延长组震积岩的发现及地质意义[J].沉积学报,2007,25(2):246-251[Xia Qingsong,Tian Jingchun.Characteristics and geological significance of seismites of the Yanchang Formation,Upper Triassic,Ordos Basin[J].Acta Sedimentologica Sinica,2007,4,25(2):246-251]
9李琦.沉积方式与碎屑岩储层的层内非均质性[J].成都理工学院学报,1996,4,23(增),22-28[Li Qi.Mode of deposition and intrafor-mational anisotropic property of reservoir of clastic rock[J].Journal of Chengdu University of Technology,1996,4,23(suppl.):22-28]
10张吉,张烈辉,胡书勇.陆相碎屑岩储层隔夹层成因、特征及其识别[J].大庆石油地质与开发,2003,22(4):1-3[Zhang Ji,Zhang Liehui,Hu Shuyong.The genesis and characteristics and identifica-tion of intercalations in reservoir of clastic rock[J].Petroleum Geolo-gy&Oilfield Development in Daqing,2003,8,22(4):1-3]
11袁彩萍,姚光庆,徐思煌,等.油气储层流动单元研究综述[J].地质科技情报,2006,25(4):21-26[Yuan Caiping,Yao Guangqing,Xu Sihuang,et al.Review on fluid flow unit in oil&gas reservoirs[J].Geological Science and Technology Information,2006,25(4):21-26]
12单敬福,纪友亮,史榕,等.高分辨率层序地层学对河流相储层薄夹层的识别及其应用[J].海洋地质动态,2006,22(5):25-29[Shan Jingfu,Ji Youliang,Shi Rong,et al.Application of high-reso-lution sequence stratigraphy to identification of thin interbeds in fluvial reservoir[J].Marine Geology Letters,2006,22(5):25-29]
13陈程,孙义梅.厚油层内部夹层分布模式及对开发效果的影响[J].大庆石油地质与开发,2003,4,22(2):24-27[Chen Cheng,Sun Yimei.The distribution patterns of the interlayers within thick pays and their impact on recovery efficiency,Shuanghe Oilfield[J].Petroleum Geology&Oilfield Development in Daqing,2003,4,22(2):24-27]
14王振彪,李伟.块状气顶底水油气藏低渗透夹层研究[J].石油勘探与开发,1996,23(6),42-46[Wang Zhenwei,Li Wei.A research method of lowpermeability interbeds within a massive petroleum reser-voir with gas cap and bottom water[J].Petroleum Exploration and Development,1996,23(6):42-46]
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