• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>SPE Oil and Gas India Conference and Exhibition >Characterization of Diagenetic Phase Transformations in Lacustrine Biogenic Silica Rich Rocks Using Porosity-Depth Trends in Barmer Basin, India.
【24h】

Characterization of Diagenetic Phase Transformations in Lacustrine Biogenic Silica Rich Rocks Using Porosity-Depth Trends in Barmer Basin, India.

机译：印度浮华盆地孔隙盆地散热趋势在湖泊生物原二氧化硅富岩中成岩相变的特征。

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Lacustrine sediments of the Barmer Hill Formation are regionally spread throughout the northern part of the Barmer Basin, India. Laminated porcellanites of this formation are hydrocarbon reservoirs of commercial interest. The siliceous sediments were originally deposited as diatom frustules that underwent diagenetic transformation to Opal-A (diatomites) then to metastable Opal-CT (porcellanites) that finally stabilized as microcrystalline quartz. The mineral phase transitions are best characterized by trends in the rock physical properties. Porcellanites are high porosity (~25p.u.), low permeability (~0.2mD) and moderate strength reservoir rocks. The diagenetic change from unconsolidated Opal-A silica to microcrystalline quartz occurs through a series of dissolution and re-precipitation processes impacting the petrophysical and mechanical properties of the rocks. Partially crystallized porcellanites have been regionally correlated in more than 500 wells within the basin. Porosity trends for these reservoir facies were analyzed in several shale content bins (Vshale windows), across the entire depth range. Necessary depth corrections were applied to offset the effect of basin uplift before comparing the compositional changes and trends of porcellanites across different fields. Weathered porcellanites in Opal-CT form are seen in surface exposures. In the subsurface, multiple porosity-depth trends are observed in porcellanites that have undergone diagenesis and compaction, simultaneously. A prominent diagenetic trend (6p.u./100m) is observed at shallower depths indicating phase transition from Opal-CT to micro-crystalline quartz. The phase transformation reactions are catalyzed by temperature and detrital content of the rocks. At a greater depth, where most of the sediments are already converted to microcrystalline quartz, the compaction trend (2p.u./100m) dominates. This trend is comparable to the regional shale compaction trend. The porosity trends, especially in Opal-CT, are further complicated by the imprint of overburden compaction and the differential uplift of the basin. The transformation boundaries are not sharp and characterized by a transition zone where porcellanite porosities reduce from about~40p.u. to ~20p.u. The X-ray diffraction data indicate that the microcrystalline quartz grains tend to improve crystallinity within these transition zones. Diagenetic maturity increases from north to south in the Barmer basin with surface exposure of Opal-CT in the northern part and pure microcrystalline quartz in the deeper southern part of the basin.
机译：Barmer Hill Closeation的湖泊沉积物在印度北部的北部部分地区分布。这种形成的层压毛细胞是商业兴趣的碳氢化合物储层。硅质沉积物最初沉积为硅藻粉末，其接受了对蛋白石-α（硅藻土）的成态转化，然后达到最终稳定为微晶石英的稳定化蛋白酶-CT（猪藻）。矿物相转变最合适的是岩石物理性质的趋势。猪菌是高孔隙率（〜25p.u。），低渗透率（〜0.2md）和中等强度水库岩石。通过一系列溶解和再沉淀过程，从未溶解的蛋白石-A二氧化硅对微晶石英的成岩变化发生在岩石的岩石物理和机械性能的一系列溶出和再沉淀过程中发生。部分结晶的猪酸盐在盆内的500多个孔中被区域相关。在整个深度范围内，在几个页岩内容箱（vshale Windows）中分析了这些水库相的孔隙度趋势。在比较跨越不同领域的猪菌的组成变化和趋势之前，应用了必要的深度校正以抵消盆地隆起的效果。在表面曝光中可以看到OPAL-CT形式的风化猪肉。在地下，在猪菌酸盐中观察到多种孔隙率深度趋势，同时经过成岩作用和压实。在较浅的深度观察到突出的成岩趋势（6p.u./100m），表明从蛋白酶-ct到微晶石英的相转变。相变反应通过岩石的温度和滴乳含量催化。在更大的深度，大多数沉积物已经转换为微晶石英，压实趋势（2p.u./100m）主导。这种趋势与区域页岩压缩趋势相媲美。孔隙率趋势，特别是在Opal-CT中，通过覆盖压实和盆的差动隆起的印记进一步复杂化。转化边界不是尖锐的，其特征在于过渡带，其中猪菌孔隙率从约约40p.u降低。到〜20p.u。 X射线衍射数据表明微晶石英晶粒倾向于改善这些过渡区内的结晶度。成岩成熟度从北部到南部的北部增加，北部的蛋白石CT的表面暴露和纯微晶石英在盆地的较深南部。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号