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首页> 外文期刊>Arabian journal of geosciences >Characteristics of the tight sand reservoirs in the delta front in the Xu-2 Member of the Upper Triassic Xujiahe Formation (Hechuan area of the central Sichuan Basin, SW China)
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Characteristics of the tight sand reservoirs in the delta front in the Xu-2 Member of the Upper Triassic Xujiahe Formation (Hechuan area of the central Sichuan Basin, SW China)

机译：三叠纪徐家海徐家海徐家河徐家河XU-2成员中三角砂藏的特点（四川盆地中部Hechuan地区）

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摘要

The Xu-2 Member of the Upper Triassic Xujiahe Formation (Hechuan area, southwestern China) is an important potential sedimentary sequence for gas exploration in the central Sichuan Basin. Thus, we performed a comprehensive study of drilling parameters, sedimentary cores, well logging, and core test data and combined our results with previous research and the geological background of the basin. We found that the Hechuan area was a delta front that included underwater distributary channels, interchannels, and mouth and distal bars during deposition of the Xu-2 Member. The sand body genetic types were divided into three categories based on where they developed: an underwater distributary channel, a mouth bar, or a distal bar. The lithology of the Xu-2 reservoirs is mainly feldspathic litharenite, lithic arkose, subarkose, litharenite, and sublitharenite. Residual intergranular pores and intergranular dissolution pores are the major pore types in the reservoirs. Reservoirs with porosities of 0.18-15.84% and permeabilities of 0.001-8.72 x 10(-3) mu m(2) showed a correlation coefficient of 0.7592. The reservoir throats are mainly tubular and constricted. Overall, the sedimentary environment and diagenesis are the major controlling factors for reservoir formation in the study area. The reservoir zones with relatively high porosity and permeability mainly developed in a delta front with underwater distributary channels and mouth bars. Chlorite growth preserved the primary pores during early diagenesis stage B, and intergranular dissolution pores resulted from contact with organic acids derived from source rocks during middle diagenesis stage A(1). Compaction and cementation significantly decreased porosity during middle diagenesis stage A(2). These important factors influenced reservoir quality.
机译：XU-2 XU-2 XUJIAHE形成（中国西南部）的XU-2成员是四川盆地中部气体勘探的重要潜在沉积序列。因此，我们对钻探参数，沉积核心，井测井和核心测试数据进行了全面的研究，并将我们的结果与之前的研究和地质背景结合在一起。我们发现，Hechuan地区是一个三角形前部，包括在XU-2成员沉积期间包括水下分配通道，互联网和口腔和远端杆。砂体遗传类型分为三类，基于它们的发展：水下分配通道，嘴巴或远端杆。徐2储层的岩性主要是长期性石英素，岩石树脂，亚泊糖，石英酸盐和宿霉菌。残留的骨髓孔和晶间溶解孔是储层中的主要孔隙类型。孔隙率为0.18-15.84％的储层和0.001-8.72×10（-3）mu m（2）的渗透性显示出0.7592的相关系数。水库喉部主要是管状和收缩。总体而言，沉积环境和成岩作用是研究区储层形成的主要控制因素。具有相对较高的孔隙率和渗透性的储层区域主要在三角洲前部开发，其中水下分配通道和嘴巴。氯酸盐生长在早期成岩作用阶段B期间保留了初级孔，并且与在中间成岩作用阶段A（1）期间与源岩中衍生的有机酸接触引起的晶间溶出孔。在中间成岩作用阶段A（2）期间，压实和胶结显着降低了孔隙率。这些重要因素影响了水库质量。

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