东海深井高温高压低孔渗储层钻井技术研究与应用   总被引：1，自引：0，他引：1  

张海山 《海洋地质译丛》2014,(2):88-92

随着近年东海勘探工作量的迅速增加,钻井深度越来越深,面临着深层高温高压低孔渗地层钻井的一些重大技术难题.针对遇到的难题,分析研究了钻井技术和工艺,主要包括深部复杂压力体系井身结构优化、构建储层保护和井壁稳定性能良好的低自由水钻井液体系、高压低孔渗储层防气窜固井工艺技术、分井段钻井提速配套技术.研究成果应用表明,该套技术较好地解决了钻井过程中出现的问题,保护了储层,提高了时效,满足了产能测试的要求.  相似文献   

Experimental evaluation of reservoir quality in Mesozoic formations of the Perth Basin (Western Australia) by using a laboratory low field Nuclear Magnetic Resonance     

《Marine and Petroleum Geology》2014

Accurate porosity and permeability evaluation of rock formations is critical to estimate the quality and resource potential of a reservoir. In addition to directly measure the porosity and pore size distribution, low field Nuclear Magnetic Resonance (NMR) is able to measure the effective porosity and estimate the in-situ formation permeability, though its robustness is arguable and requires calibrations on cores with specific lithologies.The Mesozoic formations of the central Perth Basin (Western Australia) host hot sedimentary aquifers and recently became key targets for geothermal heat extraction. A collection of cores was retrieved from three wells intersecting these units. The characterisation of their flow properties complements the current evaluation of the Perth Basin by adding new data on effective porosity, pore size distribution, pore geometry and calibration of predictive models for the permeability according to a comprehensive facies classification scheme.This study highlights the consistency of the NMR approach when compared to conventional helium injection method. Most favourable lithologies for well production correspond to very coarse to fine sandstones of fluvial channel fill with porosities >15% and permeabilities >>1 mD. Similarly, these facies exhibit (i) the highest effective porosities, (ii) the highest pore space to pore throat ratio, and (iii) the lowest contribution of clay bound water. These aspects confirm the importance of clay occurrence in the assessment of the flow efficiency of a formation.The Yarragadee Formation presents the best reservoir quality regarding its porosity and permeability, even though high discrepancies occur locally owing to the great variability of lithofacies encountered. The scattered values observed for the Lesueur Sandstone are likely to be due to the basin architecture and fault system which generate different mechanical compaction and secondary cementation. Given an adequate facies analysis, the NMR method represents a powerful tool to estimate the flow efficiency of a reservoir.  相似文献   

免烧粉煤灰滤料的制备及其性能的研究     

付晓茹  黎飞虎  方华 《南京气象学院学报》2014,6(4):363-368

为了扩大粉煤灰的应用范围,减少其对环境的污染,并且寻求一种新的水处理滤料的配方与制备方法,以粉煤灰、粘土为主要原料,以生石灰、石膏、水泥为激发剂,以H₂O₂（双氧水）、NaHCO₃为发泡剂,经搅拌、成型、自然冷却等工艺在实验室制备了免烧粉煤灰滤料.结果表明,如果以孔隙率作为主要的性能评价指标,制备免烧粉煤灰滤料的最佳质量配比为：粉煤灰46.30%,粘土13.89%,生石灰18.52%,水泥13.89%,石膏1.85%,纯H₂O₂ 5.55%,此时所制滤料的孔隙率为72.24%.  相似文献   

低孔低渗储层渗透率测井解释模型研究     

张鹏  张小莉 《地下水》2014,(2):74-76

采用岩心分析数据与测井曲线相结合的方法,引入泥质含量参数配合声波时差进行多元线性回归分析。建立鄂尔多斯盆地研究区低孔低渗储层渗透率测井解释模型。根据泥质含量特征二次分类后进行多元线性回归,建立两个渗透率测井解释模型相关性良好,对应于研究区两种不同的沉积微相特征;测井解释渗透率与岩心实测渗透率匹配良好,解释模型满足研究区精度要求。在沉积微相背景约束条件下,对研究区储层选择合理参数多元线性回归建立渗透率测井解释模型,可以使低孔低渗储层渗透率解释达到良好应用效果。  相似文献   

海拉尔盆地贝尔凹陷铜体庙组-南屯组储层次生孔隙成因及意义     

代松慧  张甜 《化工矿产地质》2014,(4):215-220

海拉尔盆地贝尔凹陷白垩系南屯组和铜体庙组凝灰质砂岩、凝灰质泥岩、沉凝灰岩和凝灰岩储层是该区主要产层。油气储集空间以次生孔隙为主。大量碱性矿物组合如柯绿泥石、钠板石、碳钠铝石、方沸石、绿磷石、铈褐帘石、铁绿泥石等的存在,证明发生了大规模碱性溶解和交代作用。晶屑、玻屑、长石和粘土等填隙物均发生不同程度的溶解现象。研究表明,次生孔隙是凝灰质储层大规模碱交代作用的结果,预示盆地深部存在油气储集空间并富集油气。  相似文献   

成藏期砂岩孔隙度对油气分布的控制作用——以东营凹陷牛庄洼陷沙三中亚段岩性油藏为例          下载免费PDF全文

刘明洁  刘震  王标  张旺  姚星  王新征  赵海燕 《地质科学》2014,(1):147-160

在具有相同储集砂体和相似断层输导情况下,牛庄洼陷沙三中亚段砂岩体油藏长期存在以下难以解释的现象：1）现今砂岩孔隙度分布与油气分布不一致,高孔隙砂岩不含油而低孔隙砂岩含油;2）相同物性砂岩有的含油而有的不含油,含油砂体现今物性接近,但含油级别却存在很大差异。本文从古孔隙度恢复方面分析了牛庄洼陷西部地区沙三中砂岩储层在成藏期的储集条件,并探讨了成藏期储层临界孔隙度。研究发现：1）虽然现今储层物性下限很低,部分砂岩已经致密化,但成藏期的古孔隙度分布在18%～25%范围内,远大于成藏期临界孔隙度13.9%。但由于埋藏过程的差异导致砂岩储层后期减孔幅度不同,因而现今储层物性不能反映成藏期储层物性,成藏期孔隙度高并不能代表现今孔隙度高;2）成藏期高孔隙度带与现今油气分布范围高度一致,表明在相似断层输导条件下,由于储层物性级差优势形成油气优势运移通道,导致高孔隙度带砂体含油,因此,沙三中亚段岩性油藏富集在成藏期高孔隙带中,成藏期砂岩古孔隙度是油气成藏的重要控制因素,而现今砂岩储层高孔隙带在成藏期并不一定高。牛庄洼陷西部地区沙三中亚段储层中具有高古孔隙度的砂岩仍有较大勘探潜力。  相似文献   

Garnet re‐equilibration by coupled dissolution–reprecipitation: evidence from textural,major element and oxygen isotope zoning of ‘cloudy’ garnet     

L. A. J. MARTIN  M. BALLÈVRE  P. BOULVAIS  A. HALFPENNY  O. VANDERHAEGHE  S. DUCHÊNE  E. DELOULE 《Journal of Metamorphic Geology》2011,29(2):213-231

The analysis of texture, major element and oxygen isotope compositions of cloudy garnet crystals from a metapelite sampled on Ikaria Island (Greece) is used to assess the model of growth and re‐equilibration of these garnet crystals and to reconstruct the pressure–temperature–fluid history of the sample. Garnet crystals show complex textural and chemical zoning. Garnet cores (100–200 μm) are devoid of fluid inclusions. They are characterized by growth zoning demonstrated by a bell‐shaped profile of spessartine component (7–3 mol.%), an increase in grossular from 14 to 22 mol.% and δ¹⁸O values between 9.5 ± 0.3‰ and 10.4 ± 0.2‰. Garnet inner rims (90–130 μm) are fluid inclusion‐rich and show a decreasing grossular component from 22 to 5 mol.%. The trend of the spessartine component observed in the inner rim allows two domains to be distinguished. In contrast to domain I, where the spessartine content shows the same trend as in the core, the spessartine content of domain II increases outwards from 2 to 14 mol.%. The δ¹⁸O values decrease towards the margins of the crystals to a lowest value of 7.4 ± 0.2‰. The outer rims (<10 μm) are devoid of fluid inclusions and have the same chemical composition as the outermost part of domain II of the inner rim. Garnet crystals underwent a four‐stage history. Stage 1: garnet growth during the prograde path in a closed system for oxygen. Garnet cores are remnants of this growth stage. Stage 2: garnet re‐equilibration by coupled dissolution–reprecipitation at the temperature peak (630 < T < 650 °C). This causes the creation of porosity as the coupled dissolution–reprecipitation process allows chemical (Ca) and isotopic (O) exchange between garnet inner rims and the matrix. The formation of the outer rim is related to the closure of porosity. Stage 3: garnet mode decreases during the early retrograde path, but garnet is still a stable phase. The resulting garnet composition is characterized by an increasing Mn content in the inner rim’s domain II caused by intracrystalline diffusion. Stage 4: dissolution of garnet during the late retrograde path as garnet is not a stable phase anymore. This last stage forms corroded garnet. This study shows that coupled dissolution–reprecipitation is a possible re‐equilibration process for garnet in metamorphic rocks and that intra‐mineral porosity is an efficient pathway for chemical and isotopic exchange between garnet and the matrix, even for otherwise slow diffusing elements.  相似文献   

洛川黄土地层渗透性与孔隙性的关系     

李云峰 《地球科学与环境学报》1991,(2)

本文用逐步回归分析方法对洛川黄土孔隙性诸要素进行了变量筛选,选出了影响渗透系数的孔隙要素,并建立了随机数学模型,定量解决了影响渗透系数的孔隙多少和孔隙形状问题,初步确定出了洛川黄土地层透水性与孔隙性的关系。  相似文献   

超压对川东南地区五峰组-龙马溪组页岩储层影响分析     

刘若冰 《沉积学报》2015,33(4):817-827

四川盆地东南部保存条件较好的五峰组-龙马溪组页岩普遍存在超压,且在其他地质条件相同的情况下,超压页岩储层相对于常压、低压储层具有更高的孔隙度.研究表明,富有机质页岩在适中的热演化过程中,由于烃类的大量生成,形成较多有机质孔隙,增加了页岩储层储集空间;另一方面,烃类大量生成造成的超压对页岩储层储集空间保存具有至关重要的作用.川东南五峰组-龙马溪组优质页岩储层孔隙以有机质孔、黏土矿物孔等塑性孔为主,且缺少刚性矿物颗粒支撑,易被上覆地层有效应力压实.但超压的存在对于页岩储层具有保护作用,抵消了上覆地层有效应力对页岩储层的机械压实,从而使已形成的页岩孔隙保存下来,使页岩储集空间得以保留.研究超压对页岩储层孔隙度影响机制以及超压页岩储层发育模式对于四川盆地五峰组-龙马溪组页岩气勘探、开发具有重要意义.  相似文献   

页岩孔隙度测量实验方法分析与评价   总被引：2，自引：1，他引：1  

杨巍  薛莲花  唐俊  吕成福  徐勇  杨爽  陈国俊 《沉积学报》2015,33(6):1258-1264

页岩气是目前国内外非常规油气领域研究的热点,有效的页岩孔隙度值是评价页岩储层物性的重要参数。由于页岩本身具有易碎的特点,导致钻取柱体样品难度大,很多学者采用碎样法计算孔隙度,但碎样法与柱体法的差别及测定结果的有效性并未见相关研究成果。本文对相同样品通过三种不同方法:氦气膨胀法测孔隙度(柱体),真、视密度法及低温氮气吸附实验法(样品粉碎至40~60目)分别计算孔隙度。结果发现三种方法测定的三组孔隙度数值不同,每种方法在样品制备上及实验方法的差别是影响实验结果的主要因素,为检验三组孔隙度值的有效性,采用数理统计中的单因素方差分析法进行分析,结果表明页岩柱体与粉碎至40~60目范围内的页岩样品测量的孔隙度值虽有差别,但在有效范围内,具有一致性。但是将页岩粉碎后,页岩中的有效孔隙变化程度较大,故用柱体测定的有效孔隙度法优于其他两种碎样方法。  相似文献