【摘要】：黏土礦物在鄂爾多斯盆地姬塬地區(qū)長6段各小層中均有分布,是該區(qū)致密砂巖儲(chǔ)層中主要的填隙物,對(duì)儲(chǔ)層物性有重要的影響。利用鑄體薄片、壓汞、掃描電鏡(SEM)、X-射線衍射(XRD)等實(shí)驗(yàn)測試技術(shù),分析儲(chǔ)層巖石學(xué)特征認(rèn)為,長6段是以長石巖屑砂巖和巖屑長石砂巖為主的低孔低滲的致密儲(chǔ)層,其平均孔隙度為7.78%~9.13%,平均滲透率為(0.20~0.34)×10-3μm2。重點(diǎn)分析黏土礦物與儲(chǔ)層物性之間的關(guān)系認(rèn)為,高嶺石和綠泥石是長6儲(chǔ)層中主要的黏土礦物,對(duì)儲(chǔ)層物性的影響較為復(fù)雜。少量的高嶺石和綠泥石往往預(yù)示著儲(chǔ)層孔隙度較好,而過量的高嶺石(絕對(duì)含量7%)和綠泥石(絕對(duì)含量10%)則會(huì)大大降低儲(chǔ)層的孔隙度。通過計(jì)算,長6儲(chǔ)層原始孔隙度為41.13%~42.04%,高嶺石充填導(dǎo)致砂巖孔隙度降低4.52%~4.78%,其損失率為10.74%~11.38%;綠泥石對(duì)長6段砂巖孔隙度的影響僅次于高嶺石,導(dǎo)致孔隙度降低4.12%~4.70%,其損失率為9.81%~11.18%。自生高嶺石對(duì)砂巖滲透率有一定的建設(shè)性作用,而綠泥石則導(dǎo)致砂巖滲透率降低。長6儲(chǔ)層中伊利石含量較高嶺石和綠泥石含量低,但由于其主要以絲縷狀呈搭橋式充填孔隙,導(dǎo)致孔隙度和滲透率均有所降低,其孔隙度降低1.33%~2.08%,損失率為3.17%~4.94%。因此,在姬塬地區(qū)長6段致密儲(chǔ)層中,黏土礦物對(duì)孔隙度的影響程度為:高嶺石綠泥石伊利石。
[Abstract]:Clay minerals are distributed in each sublayer of Chang 6 member in Jiyuan area, Ordos Basin, which is the main interstitial material in tight sandstone reservoir in this area, and has an important influence on reservoir physical properties. By using the techniques of casting thin sheet, mercury injection and scanning electron microscope (SEM),) X-ray diffraction (XRD), the petrological characteristics of the reservoir are analyzed. Chang 6 is a compact reservoir with low porosity and low permeability mainly composed of feldspathic sandstone and lithic feldspathic sandstone. Its average porosity is 7.78 ~ 9.13 and its average permeability is (0.20 ~ 0.34) 脳 10 ~ (-3) 渭 m ~ (2). It is considered that kaolinite and chlorite are the main clay minerals in Chang 6 reservoir and the influence on reservoir physical properties is complex. A small amount of kaolinite and chlorite often indicate that the reservoir porosity is good, while excessive kaolinite (absolute content 7%) and chlorite (absolute content 10%) will greatly reduce the reservoir porosity. Through calculation, the original porosity of Chang 6 reservoir is 41.13 and 42.044.The kaolinite filling results in the decrease of sandstone porosity by 4.52 and 4.78, and the loss rate is 10.74 and 11.38. The effect of chlorite on the porosity of Chang 6 sandstone is second only to kaolinite, which leads to the decrease of porosity by 4.12% and the loss rate is 9.81% and 11.18%. Authigenic kaolinite plays a constructive role in sandstone permeability, while chlorite leads to sandstone permeability decreasing. The content of Illite in Chang 6 reservoir is lower than that of kaolinite and chlorite. However, the porosity and permeability of Chang 6 reservoir are decreased due to the bridge filling, and the porosity of Chang 6 reservoir is decreased by 1.33 and 2.08, and the content of Illite in Chang 6 reservoir is lower than that of kaolinite and chlorite. The loss rate is 3.17 and 4.94. Therefore, in the tight reservoirs of Chang 6 member in Jiyuan area, the influence of clay minerals on porosity is as follows: kaolinite chlorite Illite.
【作者單位】： 甘肅省油氣資源研究重點(diǎn)實(shí)驗(yàn)室/中國科學(xué)院油氣資源研究重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院大學(xué);
【基金】：中國科學(xué)院蘭州油氣資源研究中心“十三五”創(chuàng)新基金(編號(hào):135CCJJ20160510);中國科學(xué)院創(chuàng)新促進(jìn)會(huì)會(huì)員人才計(jì)劃項(xiàng)目(編號(hào):Y410ST1LST)聯(lián)合資助
【分類號(hào)】：P618.13

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本文編號(hào)：2407620