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Source Rocks Evaluation of South Songzhan Region

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Source Rocks Evaluation of South Songzhan Region IOSR Journal of Engineering (IOSRJEN) www.iosrjen.org ISSN (e): 2250-3021, ISSN (p): 2278-8719 Vol. 06, Issue 01 (January. 2016), ||V1|| PP 01-05 Source rocks evaluation of F,Y Oil Layer in South Songzhan Region ,Songliao Basin Li Mengyao1;Wang Baojia2 1College of earth science of Northeast Petroleum University, Daqing, Heilongjiang, China. 2Xinjiang Petroleum Engineering Construction Supervision Limited Liability Company, Karamay, Xinjiang, China. Abstract: - Songzhan region is located in the northern Sanzhao depression in Songliao basin, currently F,Y layers have found oil reservoirs and good exploration prospects. But the understanding of oil source in south Songzhan region rather vague. Oil-source correlation studies have shown that: The oil in south Songzhan region 1 is mature, F,Y oil layers were derived from the same source rock—K1qn source rock in Sanzhao depression, 23 1 secondly K1qn source rock. The main K1qn source rock for the generation and expulsion period was the Mingshui final deposition to the current moment. Key words: south Songzhan, F,Y oil layers, source rocks evaluation, oil-source correlation I. INTRODUCTION South Songzhan area is located in Zhaodong Anmin Town in Heilongjiang Province, the area lying east to the west in general is low. The area is located in Sanzhao depression, which is developed in the sunken(depression) of the central paleouplift. Under the influence of regional tectonic evolution, the area has experienced three major stages of faulted, depression and uplift contraction phase, then forms the tectonic framework now. The structure of South Songzhan is a nose structure to the north of the north east of Sanzhao depression, and the development of structure has obvious inheritance, as a long-term development of ancient construction[1]. II. STRATA AND SEDIMENTARY CHARACTERISTICS South Songzhan area drills formations from the new to the old which are the Quaternary, the Upper Cretaceous K1m, K2s, the Lower Cretaceous K2n, K2y, K1qn and the part of K1q formation. In addition to deletions of the Neogene and Paleogene deposits, the above of K1q2 strata develop completely. South Songzhan oil-bearing strata are P oil layer which is the lower part of Lower Cretaceous K2y1 formation and F,Y oil layer of K1q3-4 formation, that is the basin depression stage sedimentary formation. F,Y oil layer belongs to the Lower Cretaceous K1q4 formation, which the thickness has the small lateral variation, and the average thickness is 78.0m. The sedimentary source is Baiquan-Qinggang fluvial sedimentary system, and the source is nearly north-south direction, fluvial sedimentary environment, and sedimentary rocks of the purple, gray-green mudstone and argillaceous siltstone, siltstone interbedded. The reservoirs mainly are channel sand and sand bar, and the reservoir property is medium-low. The porosity and permeability of F reservoir are generally 6.85%~14.15% and 0.01~3.5×10-3µm2, and those of Y reservoir are generally 5.2%~17.15% and 0.02~12.57×10-3µm2. Under the control of regional sedimentary background, F,Y reservoir mainly develop sedimentary microfacies such as the river, the river burst, abandoned channel. III. SOURCE ROCK EVALUATION According to the geological background of Songliao Basin, the oil source of South Songzhan area may origin from Sanzhao depression, so the source rock evaluation for Sanzhao areas could identify effective source rock, and on the basis of that carry out oil-oil correlation and oil-rock correlation. The information and data mainly come from 8 oil samples of the different blocks and layers in South Songzhan area, which are the family composition, total hydrocarbon chromatography-mass spectrometry, saturated hydrocarbons chromatography-mass spectrometry and pyrolysis, organic carbon, chloroform extract bitumen, organic [2] elements, Ro and so on . 3.1Oil-oil correlation The content of saturated hydrocarbon, aromatic, non-hydrocarbon+asphaltene in P、F，Y reservoir oil samples are 56.4%~70.58%, 17.93%~26.7%, 10.0%~19.8%, then can infer that its oil generation parent material is better. It can be seen from family consists of three components (Fig.1) of P、F,Y reservoir in South Songzhan that the characteristics are quite similar and it may be inferred homology. International organization of Scientific Research 1 | P a g e Source rocks evaluation of F,Y Oil Layer in South Songzhan Region ,Songliao Basin Fig 1 The family consists of three components of oil sample in South Songzhan The crude n-alkanes distribution pattern of South Songzhan is unimodal, and the range of carbon number distribution is nC3~nC35, and the peak carbon atoms are nC23; The content of Isoparaffin is lower than that of the adjacent normal-paraffin. As can be seen from the distribution and peak of n-alkanes, the general characteristics of the rude oil in South Songzhan are relatively similar, reflecting the crude oil with similar depositional environment and source parent material inputs (Fig.2). Dong东22（ 22(1)F1）F 8.00 Dong东22（ 22(2)F2）F Shu13-40FI树 － 7.00 13 40FI Shu5-35FI树5－35FI 6.00 树Shu15-+37FI15－加37FI2 2 % % 5.00 升Sheng91Y 91Y ， 4.00 Sheng升90P 90P Shu12-42P树12-42P 含量， 3.00 content 2.00 1.00 0.00 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 carbon碳数 number Fig 2 The n-alkanes distribution of crude oil in South Songzhan The Pr/Ph and Pr/nC17、Ph/nC18 values change with depth in South Songzhan and Sanzhao depression are similar, and illustrate that both of them have roughly the same oil source and deposition environment (Fig.3、4). International organization of Scientific Research 2 | P a g e Source rocks evaluation of F,Y Oil Layer in South Songzhan Region ,Songliao Basin Pr/PhPr/Ph 0 0.5 1 1.5 2 1000 F,Sanzhao三肇扶余 1200 Y,Sanzhao三肇扬大城子 F,South宋南扶余 Songzhan 1400 Y,South宋南杨大城子 Songzhan P,South宋南葡萄花 Songzhan 1600 /m /m /m depth/m 1800 深度 深度 深度 2000 2200 2400 Fig 3 The Pr/Ph value changes with depth of oil in South Songzhan and Sanzhao 0.60 成熟度增加 maturity increase 0.50 0.40 17 0.30 Pr/nC17 Pr/nC F,South宋南扶余 Songzhan 0.20 Y,South宋南杨大城子 Songzhan F,Sanzhao三肇扶余 Y,Sanzhao三肇杨大城子 0.10 P,Sanzhao宋南葡萄花 系列5 0.00 系列6 0.00 0.10 0.20 0.30 0.40 0.50 0.60 Ph/nCPh/nC1818 Fig 4 The Pr/nC17、Ph/nC18 values changes with depth of oil in South Songzhan and Sanzhao In summary, the oil in South Songzhan and Sanzhao depression show the same of parent material type and deposition environment, and on the hand of maturity, the oil in the same horizon of Sanzhao is higher than that of South Songzhan. Therefore, the oil in South Songzhan and Sanzhao might have the same source. 3.2 Oil-rock correlation[3-4] The OEP average value of South Songzhan samples is 1.12, and in the range of 1.04 ~ 1.18.The OEP 1 average value of Sanzhao K1qn source rock is 1.131, and in the range of 1.01 ~ 1.363, which is similar to the South Songzhan. And the mudstone of K1qn and crude oil samples has the best overlaps, therefore the 1 possibility of K1qn as the oil source is the largest, especially the K1qn (Fig.5).The Pr/Ph value of South Songzhan oil with depth remained unchanged, reflecting crude parent material has the same depositional environment. From the Pr/Ph value changes with depth of the source rock layers in Sanzhao area, the Pr/Ph 1 1 value distribution of K1qn source rock is similar to the oil sample, so the K1qn source rocks may be the source of South Songzhan crude oil(Fig.6). International organization of Scientific Research 3 | P a g e Source rocks evaluation of F,Y Oil Layer in South Songzhan Region ,Songliao Basin OEP Pr/Ph 0 1 2 3 0.6 0.9 1.2 1.5 1.8 1000 1000 1200 1200 1400 1400 1600 1600 深度 深度 depth depth 1800 1800 2000 2000 y y qn23 qn23 qn1 2200 2200 qn1 q4 q4 q3 油样oil sample q3 2400 n1 油样oil sample 2400 Fig 5 The relationship between OEP and depth of Fig 6 The relationship between Pr/Ph and depth of Sanzhao source rock and oil sample in South Sanzhao source rock and oil sample in South Songzhan Songzhan Isoprenoid alkane type compounds have affinity with the parent source. It can be seen from the Pr/nC17 and 1 Ph/nC18 correlation diagram of the South Songzhan crude oil and Sanzhao depression source rock, K1qn 、 23 K1qn and K1q4 source rock have the same depositional environment and maturity with South Songzhan parent 1 material. The relationship between South Songzhan crude oil and K1qn source rock is more closer than the other layers (Fig.7).It can be seen from the hydrocarbon source rock evaluation that, the main source rock are 1 23 1 K1qn and K1qn source rock in Sanzhao area.The sterane C29-20S/(20S + 20R) and C29-ββ/(αα+ββ) of K1qn Source rock has the similar maturity with oil sample, except for the other source rock(Fig.8). South Songzhan crude oil may come from K1qn source rock. qn23 1.4 qn1 1.2 q4 1 q3 oil油样 sample 0.8 n12 0.6 Ph/nC18 0.4 0.2 1.4 0 1.4 Pr/nC17 1.2 0 0.3 0.6 0.9 1.2 1.5 Fig 7 The relationship between Pr/nC17、Ph/nC18 and depth of Sanzhao source rock and oil sample in South SongzhanPr/nC17 International organization of Scientific Research 4 | P a g e Source rocks evaluation of F,Y Oil Layer in South Songzhan Region ,Songliao Basin 1.8 0.7 q3 mature成熟 0.6 1.6 q4 1.4 Y区qn1 0.5 oil 1.2 J区qn1 油样sample 0.4 q3 1 Z区qn1 low-mature低熟 q4 油样oil 0.3 0.8 sample Y区qn1 0.6 0.2 J区qn1 0.4 Z区qn1 0.1 immature 0.2 C29ααα-20S/(20S+20R) 未熟 qn23 C28ααα20R/C29ααα20R 0 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 0.5 1 1.5 2 2.5 3 － ／（ ＋ ） C29 ββ αα ββ C27ααα20R/C29ααα20R Fig 8 The sterane maturity of crude oil in Sanzhao source rock and South Songzhan region IV.
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