中国地质
中國地質
중국지질
CHINESE GEOLOGY
2015年
1期
288-299
,共12页
顾志翔%彭勇民%何幼斌%胡宗全%翟羽佳
顧誌翔%彭勇民%何幼斌%鬍宗全%翟羽佳
고지상%팽용민%하유빈%호종전%적우가
湘中坳陷%二叠系%页岩气%保存条件
湘中坳陷%二疊繫%頁巖氣%保存條件
상중요함%이첩계%혈암기%보존조건
central Hunan depression%Permian%shale gas%preservation conditions
提根据湘中坳陷二叠系黑色页岩的露头及岩心观测、含气量、地化和物性资料，以及等温吸附、氩离子抛光+扫描电镜等方法所获数据，探讨了页岩气地质条件。研究认为二叠系龙潭组、大隆组海陆过渡相页岩具备良好的页岩气地质条件。有机碳含量在2%以上；成熟度分布于1.2%~1.6%；储集类型主要为残留粒间孔、粒内孔、溶蚀孔等矿物质孔和少量有机质孔，孔隙度在0.54%~5.15%，等温吸附实验测试平均含气能力在5.488~6.905 m3/t。热演化史分析表明二叠系页岩在沉积之后经历了两次抬升剥蚀，第二次沉降没有达到第一次的最大埋深且没有二次生烃，这可能是导致研究区页岩总体含气量低的原因之一。构造分析表明，印支期和燕山期改造作用，对油气破坏明显，恶化了保存条件增加勘探风险。运用叠合法预测页岩气有利区为湘中涟源—娄底—双峰区、邵阳—邵东区，采用体积法计算页岩气总资源量为(127~425）×108 m3（中值254×108 m3），显示一定的页岩气资源潜力。综合分析认为保存条件是该区页岩气成藏的关键因素，也是勘探成功与否的首要因素。
提根據湘中坳陷二疊繫黑色頁巖的露頭及巖心觀測、含氣量、地化和物性資料，以及等溫吸附、氬離子拋光+掃描電鏡等方法所穫數據，探討瞭頁巖氣地質條件。研究認為二疊繫龍潭組、大隆組海陸過渡相頁巖具備良好的頁巖氣地質條件。有機碳含量在2%以上；成熟度分佈于1.2%~1.6%；儲集類型主要為殘留粒間孔、粒內孔、溶蝕孔等礦物質孔和少量有機質孔，孔隙度在0.54%~5.15%，等溫吸附實驗測試平均含氣能力在5.488~6.905 m3/t。熱縯化史分析錶明二疊繫頁巖在沉積之後經歷瞭兩次抬升剝蝕，第二次沉降沒有達到第一次的最大埋深且沒有二次生烴，這可能是導緻研究區頁巖總體含氣量低的原因之一。構造分析錶明，印支期和燕山期改造作用，對油氣破壞明顯，噁化瞭保存條件增加勘探風險。運用疊閤法預測頁巖氣有利區為湘中漣源—婁底—雙峰區、邵暘—邵東區，採用體積法計算頁巖氣總資源量為(127~425）×108 m3（中值254×108 m3），顯示一定的頁巖氣資源潛力。綜閤分析認為保存條件是該區頁巖氣成藏的關鍵因素，也是勘探成功與否的首要因素。
제근거상중요함이첩계흑색혈암적로두급암심관측、함기량、지화화물성자료，이급등온흡부、아리자포광+소묘전경등방법소획수거，탐토료혈암기지질조건。연구인위이첩계룡담조、대륭조해륙과도상혈암구비량호적혈암기지질조건。유궤탄함량재2%이상；성숙도분포우1.2%~1.6%；저집류형주요위잔류립간공、립내공、용식공등광물질공화소량유궤질공，공극도재0.54%~5.15%，등온흡부실험측시평균함기능력재5.488~6.905 m3/t。열연화사분석표명이첩계혈암재침적지후경력료량차태승박식，제이차침강몰유체도제일차적최대매심차몰유이차생경，저가능시도치연구구혈암총체함기량저적원인지일。구조분석표명，인지기화연산기개조작용，대유기파배명현，악화료보존조건증가감탐풍험。운용첩합법예측혈암기유리구위상중련원—루저—쌍봉구、소양—소동구，채용체적법계산혈암기총자원량위(127~425）×108 m3（중치254×108 m3），현시일정적혈암기자원잠력。종합분석인위보존조건시해구혈암기성장적관건인소，야시감탐성공여부적수요인소。
Based on such analytical methods as outcrop core observation, gas content, geochemical and physical property data and isothermal adsorption as well as argon ion polishing plus scanning electron microscopy of Permian black shale in the center of Hunan depression, the authors investigated the geological conditions of shale gas. The results show that the geological conditions of shale in Permian Longtan Formation and Dalong Formation of sea-land transitional facies are beneficial to gas accumulation. The
<br> organic carbon content is high than 2%, the grade of maturity distribution is between 1.2%and 1.6%, the main reservoir types are mineral holes with minor organic holes such as residual intergranular pores, intragranular pores and corrosion holes. The porosity is between 0.54% and 5.15%,the average gas content capacity of isothermal adsorption test is between 5.488 and 6.905 m3/t. The thermal evolution analysis shows that Permian shale experienced two times of uplift and denudation, and the second denudation didn’t reach the maximum depth of the first time and there was no secondary hydrocarbon. This might have been the reason which led to the low gas content in the study area. Structural analysis shows that the modification effect of Indo-Chinese epoch and Yanshanian period resulted in the poor preservation conditions that damaged the oil gas obviously and increased the risk of exploration. Using the method of superposition to predict the areas, the authors reveal that Lianyuan-Loudi-Shuangfeng area and Shaoyang-Shaodong area are favorable shale gas areas. The volume method was used to calculate the total quantity of shale gas resource, which yielded (127-425)×108 m3, (the medium value being 254×108 m3),suggesting a certain potential of shale gas resources. The comprehensive analysis shows that the preservation condition is the key factor for shale gas accumulation in this area, and is also the principal factor for successful exploration.
