第40卷第2期
天然气勘探与开发
地质勘探
苏里格气田东区奥陶系岩溶古地貌对气藏产能的影响白慧1.2杨国平3马志欣12冯敏12郝骞12李锦红12石林辉12
1.中国石油长庆油田分公司苏里格气田研究中心2.低渗透油气田勘探开发国家工程实验室
3.中国石油长庆油田分公司第二采气厂
摘要岩溶古地貌是鄂尔多斯盐地苏里格气田奥陶系天然气聚集的控制因素之一，寻找古岩溶储层有利发育区带对气田天然气开发具有重要意义，苏里格气田奥陶系署溶古地貌单元可划分为岩溶高地、岩落斜坡、岩露盐地，气田东区下奥陶统马家沟组位于古岩落斜被之上，依据古岩落和碳酸盐岩成截地质理论，对古署募成因和着落古地航发育特征进行研究。认为：①研究区
有利于天然气富集，是天然气高产井的目标区；②戎丘边缘地带的溶蚀孔、
岩溶斜披的古拔地溶蚀作用强烈，主力气层保存完整，
利较发育，有利于形成储集空间，溶蚀沟槽为天然气运移提供了有利通道，
古残丘与古为槽之间的过渡带有利于成藏，
古残丘、
是井位部署的有利区；①古沟槽使署溶斜被经受切割导致主力层缺失，充填作用强烈，不利于储层发育，古注地落蚀淋滤作用较弱，储层较为致密或成为富水区，含气性差，不利于天然气富集，低产或不具产能的气并广泛分布在古沟槽和古准地地貌单元内。
苏里格气田
关键词
那尔多斯金地
奥陶纪
岩溶古地貌
DO1: 10.12055/gaskk.issn.1673-3177.2017.02.004
制作用古坡地古残丘
气藏
Theeffectof Ordoviciankarstpalaeogeomorphologyongasreservoirintheeastof
SuligeGasField
Bai Hui'2, Yang Guoping”,Ma Zhixin', Feng Min'2, Hao Qian', Li Jinhong"2, Shi Linhui'2
(I.Sulige Gas Field Research Center, PetroChina Changqing Oifield Company, Xi'an,Shaanxi 710018, China; 2. National Engineering Laboratory of Low-permeability Oil & Gas Exploration and Development, Xi'an, Shaanxi 710018,China;3.No.2GasProductionPlant,PetroChina ChangqingOifieldCompany,Yulin,Shaanxi719100, China)
Abstract: In the Sulige Gas Field, the Ordos Basin, karst palaeogeomorphology is one of the factors controlling the accumulation of Ordovician natural gas, so searching for favorable development zones of palaeokarst reservoirs is of great significance to the develop-ment of the gas field. The Ordovician karst palaeogeomorphology in the Sulige Gas Field can be divided into 3 units, i.e, karst high-land, karst slope and karst basin. The Lower Ordovician Majiagou Formation in the east of Sulige Gas Field is located above palae okarst slope, In this paper, the origins of palaeokarst and the development characteristics of karst palaeogeomorphology were analyzed according to geology theory of palaeokarst and carbonate reservoir formation., It is indicated that the karst slope in this area is the tar-get region of high-yield gas wells for its palaeoslope dissolution is strong and the main gas reservoirs are preserved completely, which is favorable for gas enrichment. The dissolved pores and vugs at the edge of monadnock are well developed, which is beneficial to the formation of reservoir space, The dissolved grooves act as the favorable pathways for the migration of natural gas, The palaeomonad-nocks and the transition zones between palaeomonadnock and palacogroove are favorable for hydrocarbon accumulation, and they are the favorable areas for well location deployment. On the other hand, however, karst slopes are cut by palaeogrooves, so principal lay-ers are absent and flling action is strong, which is unfavorable for reservoir development. In palaeotroughs, dissolution and leaching effect are weaker, reservoirs are relatively tight or become water rich areas, so the gas bearing property is poor, which is unfavorable for natural gas enrichment. Gas wells of low or zero yield are widely distributed in the geomorphologic units of palaeogroove and pa-laeotrough.
Keywords: Ordos Basin; Sulige Gas Field; Ordovician; Karst palaeogeomorphology; Gas reservoir; Control action; Palaeoslope; Pa-laeomonadnock
基金项目：国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程（编号：2016ZX05050）和中国石油天然气股份有限公司科技专项“长庆气田稳产及提高采收率技术研究"（编号：2016E-0509)。
第一作者：白慧，女，1984年生，工程师；从事气田开发地质研究工作。地址：（710018）陕西省西安市末央区风城四路73号长庆苏里格大厦。电话：18792853631。E-mail:bhui_cq@petrochina.com.cn
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