碳酸盐岩层序地层格架内组构选择性孔隙分布特征——以塔里木盆地塔中地区上奥陶统良里塔格组台地边缘相为例

发布时间：2018-07-21 21:09

【摘要】：组构选择性孔隙是塔中地区良里塔格组台地边缘相油气储集层的重要孔隙类型,目前该类型的孔隙在层序地层格架内的分布特征仍不清晰。作者在前人建立的层序地层格架的基础上,通过大量的岩心、薄片、测井及地震资料的分析,在塔中地区良里塔格组台地边缘相识别出7类主要组构选择性孔隙:粒内溶孔、粒间溶孔、铸模孔、粒间孔、窗格孔、生物体腔孔及格架孔。高频层序中,组构选择性孔隙在90%的礁(丘)滩复合体中上部的大气淡水渗流带—潜流带中成层集中发育,厚度10~40 m,且各类型孔隙纵向上分布特征不同。受研究区湿润的古气候、相对海平面的频繁波动、台地边缘礁滩相较大的沉积速率及较好的初始渗透性等因素控制,组构选择性孔隙的发育具有层位性、旋回性及区块差异性等分布规律。即组构选择性孔隙层主要发育在高位体系域内沉积的良三段—良一段中;纵向上发育5期,主要分布在进积型准层序组6、8及9中,其次是加积型准层序组5、7、10;自东向西,各井区孔隙层数量、厚度及物性均逐步降低,主要孔隙类型由粒内溶孔、铸模孔、粒间溶孔及体腔孔逐渐变为以窗格孔、粒内溶孔及粒间溶孔。
[Abstract]:Fabric selective porosity is an important pore type in the platform margin of the Lianglitag formation in the Tazhong area. At present, the distribution characteristics of this type of pore in the sequence stratigraphic framework are still unclear. On the basis of the sequence stratigraphic framework established by the predecessors and through the analysis of a large number of cores, thin slices, logging and seismic data, the authors have identified seven types of major fabric selective pores: intragranular dissolved pores in the platform margin of the Lianglitag formation in the Tazhong area. Intergranular solution hole, mold hole, intergranular hole, pane hole, biological cavity hole pass rack hole. In the high frequency sequence, the fabric selective pores are concentrated in the upper and middle of 90% of the reef (hilly) beach complex in the atmosphere fresh water percolation zone and submersible flow zone, the thickness is 10 ~ 40 m, and the vertical distribution characteristics of different types of pores are different. Controlled by the moist paleoclimate, frequent fluctuation of relative sea level, larger deposition rate and better initial permeability of reef and beach facies on the edge of platform, the development of fabric selective pores is stratospheric. Cyclicity and block difference. In other words, the fabric selective porosity is mainly developed in the third and first member of the good third member deposited in the upper system domain, and in the 5 stages of longitudinal development, mainly distributed in the precession type of quasequence group 6, 8 and 9, followed by the accretive type of the quasequence group, 5yun710, from east to west, and from east to west. The number, thickness and physical properties of pore layers in each well area are gradually decreased, and the main pore types are gradually changed from intragranular dissolved pore, mold pore, intergranular dissolved pore and body cavity pore to pan-hole, intragranular dissolved pore and intergranular dissolved pore.
【作者单位】：西南石油大学天然气地质四川省重点实验室;西南石油大学地球科学与技术学院;西南石油大学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】：国家自然科学基金(编号:41702163;41702122) 天然气地质四川省重点实验室开放基金资助项目(编号:2015trqdz05) 西南石油大学科研“启航计划”(编号:2017QHZ008) 国家科技重大专项(编号:2011ZX05004-004)共同资助~~
【分类号】：P618.13

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