库车坳陷K区块冲断带深层白垩系致密砂岩裂缝发育规律、控制因素与属性建模研究

发布时间：2018-01-01 10:09

本文关键词：库车坳陷K区块冲断带深层白垩系致密砂岩裂缝发育规律、控制因素与属性建模研究　出处：《岩石学报》2016年03期 　论文类型：期刊论文

【摘要】：针对致密砂岩气藏裂缝预测的复杂问题,本文以库车坳陷K区块为例,提出基于裂缝精细描述的属性建模方法,为该区裂缝预测提供新思路。首先基于岩心和成像测井裂缝解释模型,采用网格法获取裂缝参数,包括裂缝延伸长度(2~1850mm)、裂缝密度(平均值0.53条/米)、裂缝宽度(集中分布在0.1~0.4mm)、倾角(56°~82°)及面缝率(0.016%~0.083%)。该区影响裂缝发育的主要因素有构造、层厚以及埋深。不同构造部位裂缝发育规律不同:背斜核部发育张裂缝,其宽度和长度呈高值;翼部主要发育X剪裂缝,宽度、长度和密度都处于相对低值;近断裂附近发育高角度裂缝,密度呈高值。层厚与裂缝密度及面缝率成反比。K区目的层是深-超深埋深,随着埋深的增加,矿物脆性减弱韧性增强,超过临界点(7100m)裂缝的发育逐渐减弱。应用Petrel软件,利用裂缝精细描述数据库、构造数据和层面数据等,实现裂缝密度和面缝率模型的建立。最后,探索性的研究裂缝参数和渗透率的相关性,通过裂缝密度参数拟合渗透率模型,实现K区块的渗透率定量预测。
[Abstract]:Aiming at the complex problem of fracture prediction in tight sandstone gas reservoir, this paper presents an attribute modeling method based on fine description of fractures, taking K block in Kuqa depression as an example. It provides a new idea for fracture prediction in this area. Firstly, based on the interpretation model of core and imaging logging fractures, the fracture parameters are obtained by grid method, including the fracture extension length (2? 1850mm). Fracture density (mean 0.53 / m ~ (-1), crack width (concentrated at 0.1 ~ 0.4mm)). The slope angle is 56 掳/ 82 掳) and the surface fracture ratio is 0.016 / 0.083. The main factors affecting the fracture development in this area are structure. Layer thickness and buried depth. The fracture development law is different in different structural positions: the width and length of extensional fractures in the nucleus of anticline are high; X shear cracks are mainly developed in the pterygoid, and the width, length and density are relatively low. Near the fault there are high angle fractures with high density. The thickness of the layer is inversely proportional to the fracture density and the fracture rate. The target layer in the K area is deep to ultra deep buried depth. With the increase of buried depth the brittle toughness of the mineral is enhanced. The development of fracture is gradually weakening over the critical point (7100m). Using Petrel software, using crack fine description database, structural data and plane data, etc. Finally, the correlation between fracture parameters and permeability is studied, and the permeability model is fitted by fracture density parameters to realize the quantitative prediction of permeability in K block.
【作者单位】：西南石油大学地球科学与技术学院;油气藏地质及开发工程国家重点实验室;中国石油塔里木油田分公司;
【基金】：国家科技重大专项(2011ZX05004-004) 国家自然科学基金项目(41472103) 四川省教育厅科研基金(14ZB0058)联合资助
【分类号】：P618.13
【正文快照】： 致密砂岩油气藏储层中,裂缝作为重要的储集空间和油库车坳陷K区块为例,通过露头、岩心、成像测井等资料,对气运移的通道,对油气产出起着至关重要的作用(Dholakia et库车坳陷K区裂缝进行精细描述。其中,岩心描述采用网格al.,1998;Sakhaee-Pour and Bryant,2014)。但受到岩性、

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