CAJ | 학술논문

砂岩储层中局部钙的富集是影响储层物性的重要因素之一，因此揭示钙形成的主控因素及形成机理，对油田后期的高效开发无疑具有重要意义。在砂质碎屑岩中，钙的富集一般以“钙尖”的形式产出，有顶底钙形式、也有团块状等等。本文通过物理化学分析手段，剖析钙离子的来源，钙离子富集条件及钙质沉淀机理及其主控因素。研究结果表明，钙离子主要在同生、表生与深埋成岩作用期析出，各类酸性水是其催化条件。在同生与表生作用期，在湖（海）平面下降，河道变迁等条件下，通过蒸发作用，化学反应平衡左移，形成含钙化合物沉淀。利用苏里格气田东区目的层丰富的地下水地球化学组成分析资料，经综分析表明，目的层钙质夹层形成地质条件复杂，为深埋成岩、同生与表生混合作用下的产物，其中深埋成岩作是其主要形成时期，而其余少量钙质夹层则是在同生或表生期形成，并进一步明确了深埋成岩作用是苏里格气田东区钙质夹层富集的主控因素。
사암저층중국부개적부집시영향저층물성적중요인소지일，인차게시개형성적주공인소급형성궤리，대유전후기적고효개발무의구유중요의의。재사질쇄설암중，개적부집일반이“개첨”적형식산출，유정저개형식、야유단괴상등등。본문통과물이화학분석수단，부석개리자적래원，개리자부집조건급개질침정궤리급기주공인소。연구결과표명，개리자주요재동생、표생여심매성암작용기석출，각류산성수시기최화조건。재동생여표생작용기，재호（해）평면하강，하도변천등조건하，통과증발작용，화학반응평형좌이，형성함개화합물침정。이용소리격기전동구목적층봉부적지하수지구화학조성분석자료，경종분석표명，목적층개질협층형성지질조건복잡，위심매성암、동생여표생혼합작용하적산물，기중심매성암작시기주요형성시기，이기여소량개질협층칙시재동생혹표생기형성，병진일보명학료심매성암작용시소리격기전동구개질협층부집적주공인소。
The partly enrichment of calcium in sandstone reservoir is one of the important factors affecting the reservoir properties.So the controlling factors and forming mechanism of the enriched calcium is undoubtedly of great significance to the efficient development of the oilfield.In the sandy clastic rocks,calcium enriched with“calcium sharp”in the shape of a top bottom or the mass etc.In this paper,by using physical and chemical methods,the source of calcium,conditions of calcium enrichments and deposition mechanism were analysis. Theresearchresults show that the calcium ions release mainly in the period of syngenetic,supergene and buried lithogenesiswith various acidic water play the part of catalyzing.In the syngenesisand supergenestage,the lake (sea)level falls and the river channel changes,calcium containing compound precipitates through evaporation and chemical reaction equilibrium shift to the left and so does the hypergenesis stage.In addition,the analysis results showed that cause of calcium interlayers are complex including the period of syngenetic,buried diagenesis stage and supergene period by abundant groundwater geochemistry data in eastern block of Sulige gas field.Among them,the buried diagenesisis the most important,and whichwasamain controlling factor.