本文關(guān)鍵詞：饒陽凹陷沙河街組碎屑巖儲層碳酸鹽膠結(jié)物形成機(jī)制及其對儲層質(zhì)量的影響　出處：《礦物巖石》2017年02期 　論文類型：期刊論文

  更多相關(guān)文章： 碳酸鹽膠結(jié)物 碳氧同位素 儲層質(zhì)量 形成機(jī)制 沙河街組 饒陽凹陷

【摘要】：通過薄片鑒定、掃描電鏡和陰極發(fā)光觀察對饒陽凹陷沙河街組碎屑巖儲層的22口探井864個薄片樣品的碳酸鹽膠結(jié)物進(jìn)行期次劃分,再據(jù)各期膠結(jié)物的共生礦物研究、碳氧同位素分析、流體包裹體測溫等對其形成機(jī)制進(jìn)行研究。研究結(jié)果表明研究區(qū)共發(fā)育3期碳酸鹽膠結(jié)物:第一期以粒狀方解石為主,其形成于巖石充分壓實之前的早成巖階段,伴生少量的黃鐵礦膠結(jié);第二期以粒狀細(xì)晶級為主,多發(fā)育方解石、白云石,以斑塊狀以及嵌晶式連生方式賦存,與前期的膠結(jié)物之間常形成一層黏土薄膜;第三期以柱狀或粒狀細(xì)晶級形式存在,以方解石、白云石、鐵方解石以及鐵白云石成分為主,充填長石等易溶性顆粒溶孔及交代早期碳酸鹽膠結(jié)物。據(jù)膠結(jié)物碳氧同位素分析恢復(fù)古鹽度Z值及測算古地溫判斷早期膠結(jié)物來源于古鹽度較高的淡水成因流體;再根據(jù)膠結(jié)物流體包裹體均一溫度判斷方解石膠結(jié)物形成于中成巖A期,為有機(jī)酸脫羧基生成大量CO_2,使化學(xué)平衡向著生成碳酸鹽的方向移動,表示其"碳"來源為有機(jī)碳。對儲層質(zhì)量影響方面,早期碳酸鹽膠結(jié)物增加了砂體的抗壓實能力,對研究區(qū)儲層質(zhì)量的影響是正面的,而中后期碳酸鹽膠結(jié)物充填長石及巖屑溶蝕作用形成的孔隙,對儲層質(zhì)量的影響是負(fù)面的。
[Abstract]:The carbonate cementation of 864 thin slice samples in 22 exploration wells of Shahejie formation in Raoyang sag was divided by scanning electron microscope and cathodoluminescence observation. Based on the study of symbiotic minerals in each period, carbon and oxygen isotopes were analyzed. The formation mechanism of fluid inclusions was studied by temperature measurement. The results show that the carbonate cementation in the study area is of three stages: the first stage is mainly granular calcite. It was formed in the early diagenetic stage before the rock was fully compacted, accompanied by a small amount of pyrite cementation. The second stage is mainly granular fine grained with calcite and dolomite occurring in the form of plaques and embedded crystals. A layer of clay film is often formed between the grained fine grained grains and the early cemented materials. The third stage exists in the form of columnar or granular fine grained, mainly composed of calcite, dolomite, iron calcite and iron dolomite. Filling feldspar and other easily soluble granular dissolved pores and carbonate cement in early metasomatism. Recovery of paleosalinity Z value by carbon and oxygen isotopic analysis of cementation and estimation of paleo-geothermal temperature to judge that the early cementation originated from freshwater fluids with high paleosalinity. ; According to the homogenization temperature of cemented material inclusions, calcite cementation was formed in the middle diagenetic A stage, and a large amount of CO2 was formed from organic acid decarboxyl group, which made the chemical balance move towards the direction of carbonate formation. It is indicated that the source of "carbon" is organic carbon. In terms of the effect on reservoir quality, the early carbonate cement increases the compaction resistance of sand body, and the effect on reservoir quality in the study area is positive. The effect of carbonate cementation on reservoir quality is negative due to the formation of pores formed by feldspar and lithic dissolution.
【作者單位】： 油氣藏地質(zhì)及開發(fā)工程國家重點實驗室(成都理工大學(xué));中國石油天然氣股份有限公司華北油田分公司;中國石油西南油氣田公司川中油氣礦;四川師范大學(xué)地理與資源科學(xué)學(xué)院;
【基金】：國家自然科學(xué)基金項目(41372141) “十三五”國家重大專項(2016ZX05024002-007)
【分類號】：P618.13
【正文快照】： 1.油氣藏地質(zhì)及開發(fā)工程國家重點實驗室(成都理工大學(xué)),四川成都610059;2.中國石油天然氣股份有限公司華北油田分公司,河北任丘062552;3.中國石油西南油氣田公司川中油氣礦,四川遂寧629001;4.四川師范大學(xué)地理與資源科學(xué)學(xué)院,四川成都p膒苝蘰，

本文編號：1401647