源下致密砂岩储层垂向成岩非均一性成因机制  

Genetic mechanism of vertical diagenesis heterogeneity in tight sandstone as underlying reservoirs of source rocks

作　　者：李丹 林承焰[2] 董春梅[2] 杨玲 朱兆群 马存飞 毛毳[3] 张涛[4] LI Dan;LIN Chengyan;DONG Chunmei;YANG Ling;ZHU Zhaoqun;MA Cunfei;MAO Cui;ZHANG Tao(School of Earth Science and Engincering,Hebei University of Engineering,Handan,Hebei 056038,China;School of Geosciences,China University of Petroleum,Qingdao,Shandong 266580,China;School of Geosciences,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;Shandong Provincial Key Laboratory of Depositional Mineralization&Sedimentary Mineral,Shandong University of Science and Technology,Qingdao,Shandong 266590,China)

机构地区：[1]河北工程大学地球科学与工程学院,河北邯郸056038 [2]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [3]东北石油大学地球科学学院,黑龙江大庆163318 [4]山东科技大学山东省沉积成矿作用与沉积矿产重点实验室,山东青岛266590

出　　处：《中国矿业大学学报》2020年第4期693-707,共15页Journal of China University of Mining & Technology

基　　金：国家科技重大专项(2017ZX05009-001);河北省自然科学基金项目(D2017402165);河北省高等学校科学技术研究项目(QN2017036);国家自然科学青年基金项目(41702154);山东省沉积成矿作用与沉积矿产重点实验室开放基金(DMSM2018056);邯郸市科技研发计划项目(1721211051-1);吉林油田科研项目(JS11-W-13-JZ-40-76)。

摘　　要：致密砂岩油气作为一种非常规油气资源备受关注.为揭示源下致密砂岩储层垂向成岩非均一性成因机制,依据薄片鉴定、扫描电镜、黏土矿物X衍射、包体测温及物性测试等多项分析测试技术,对松辽盆地南部青一段烃源岩下伏泉四段致密砂岩储层开展垂向成岩非均一特征研究,认为储层所受压实作用强烈,是造成储层减孔效应的主导因素;垂向上压实效应整体受控于埋深;碳酸盐胶结的减孔效应在诸类胶结作用中最为显著,其胶结物含量在垂向上呈现先增后减的非均一特征;溶蚀作用整体较弱,以钾长石的溶蚀为主,垂向上溶蚀面孔率呈现先增后减的演变规律.研究结果表明:基准面旋回控制成岩作用垂向分异所需的物质基础的形成,为后期垂向压实非均一性及含烃成岩流体在垂向上的非均一充注提供物质基础和空间格架;源-断-砂配置关系的纵向分异导致4种含烃成岩流体运移模式的垂向演变,其中模式④分布频率为68.9%,为研究区主导运移模式;"优势充注体"控制超压含烃成岩流体"倒灌"过程中的优势充注层位并导致垂向差异成岩效应,造成Ⅱ,Ⅲ砂组相对强烈的溶蚀与碳酸盐胶结作用,且在一定程度上制约了后期压实作用的进行,进而有利于垂向上"甜点段"的形成.As a kind of unconventional petroleum resources,tight sandstone oil and gas is getting more and more attention.In order to reveal the genetic mechanism of vertical diagenesis heterogeneity in tight sandstone as underlying reservoirs of source rocks,the Fuyu oil layer in southern Songliao Basin was taken as an example.Based on various measurements e.g.thin-sections analysis,scanning electron microscope,X-ray diffraction of clay minerals,temperature measurement of fluid inclusions and physical property testing,this paper studied the vertical diagenesis heterogeneity and focused on its genetic mechanism in tight sandstone of Quantou 4 member as underlying reservoirs of source rocks of Qingshankou 1 member.The following results were obtained:Compaction,controlled by vertical depth,is intensive and is the main factor making the reservoirs tight.The pore-reducing effect of carbonate cement is prominent,and the contents of carbonate cement increase at first and then decrease vertically.Overall the corrosion is less intensive,and the corroded component is mainly the potassium feldspar.The secondary pores increase at first and then decrease vertically.Research results show that base level cycle controls the formation of material base,leading to vertical differentiation of diagenesis as a whole and providing material base and spatial framework for vertical heterogeneity of compaction and heterogeneous filling of diagenetic fluid with hydrocarbon vertically.The vertical differentiation of relation among sources rocks,faults and sandstone leads to the vertical evolution of diagenesis fluid with 4 hydrocarbon migration patterns,and the distribution frequency of pattern④is 68.9%,being the dominant migration pattern in the study area.The"dominant filling body"controls the position that the overpressure fluid with hydrocarbon migrate downward into preferentially,creating relatively strong dissolution and carbonate cementation of sand groupsⅡandⅢ,leading to inhomogeneous diagenesis effect,restricting the later compaction,an

关 键 词：烃源岩下伏储层 致密砂岩 垂向成岩非均一性 “优势充注体” 松南盆地 扶余油层 

分 类 号：TE122[石油与天然气工程—油气勘探]