摘要
根据13口新井岩心、物性、测井、试气、气组分和氦气分布等资料,结合区域构造演化、沉积背景和典型气藏剖面,分析并总结富氦天然气藏地质特征及成藏主控因素。研究结果表明:自下而上发育基底花岗岩和变质岩裂缝型气藏、上泥盆统致密砂岩构造气藏和下石炭统大面积分布的连续型碳酸盐岩气藏;构造高点裂缝发育形成高产,构造低点普遍含气;干气天然气中富含氦气,氦气含量自下向上逐渐减少;广覆式分布的前泥盆系花岗岩和变质岩基底为氦气主要来源,上泥盆统和下石炭统百米厚度高伽马砂岩作为次要氦源;断层形成双向输导,一方面将下石炭统烃源岩生成的烃类气体向下运移至上泥盆统和基底圈闭;另一方面将下部生成的氦气向上运移至下石炭统气藏中;下石炭统顶部发育厚层、互层状硬石膏和致密灰岩作为区域盖层对富氦天然气藏起到保存作用。
Based on core data,physical property,well logging,gas test,composition,helium distribution of 13 new wells,in combination with regional tectonic evolution,depositional background and typical gas reservoir profile,geological characteristics and main controlling factors of helium-rich gas reservoirs have been explored.The results show that three gas reservoirs formed from bottom to top,i.e.,granite and metamorphite fractured reservoir in basement,tight sandstone structural reservoirs in Devonian and huge continuous carbonate reservoirs in Lower Carboniferous.The fracture developed on structural points controls high production and gas is well displayed in low structural area.Dry gas is rich in helium and the helium content is lower from basement to Carboniferous.The pre-Devonian large-scale granite and metamorphite basement is the main helium source,and the high-gamma sandstones of Devonian and Carboniferous are the secondary source.The fracture is filled up and conducts in two-ways,gas from Carboniferous source rocks migrate downward and helium migrate upward.Thick interbedded gypsum-tight limestone on the top of Lower Carboniferous is the regional caprock preserving helium-rich gas reservoir.
作者
谷晓丹
贾承造
陈践发
姜林
GU Xiaodan;JIA Chengzao;CHEN Jianfa;JIANG Lin(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2023年第10期1801-1814,共14页
Natural Gas Geoscience
基金
国家重点基础研究发展计划“973”项目(编号:2011CB201100)
国家重点研发计划项目(编号:2021YFA071900)联合资助.
关键词
苏克气田
构造气藏
连续型碳酸盐岩气藏
富氦气藏
地质特征
成藏主控因素
Sozak Gas Field
Structural reservoirs
Continuous carbonate reservoirs
Helium-rich gas reservoirs
Geology characteristics
Main controlling factors
