29 4 20 8 ACTA SEDIMENTOLOGICA SINICA Vol. 29 No. 4 Aug. 20 000-0550 20 04-0809-06 2 2 3. 730000 2. 00049 3. 067000 8 W008 ~ W05 20 cm 50 cm 00 cm 80 cm 300 cm 500 cm 000 cm 700 cm R o H /C O /C A 5 80 cm R o 80 cm R o W008 W009 H /C 0. 385 0. 404 W0 ~ W05 H /C 0. 5 O /C 0. W008 W009 O /C W00 W0 W008 A W009 ~ W02 W008 W009 W00 CPI W02 W04 ~. 8 m. 8 m 983 E-mail liuxingwang@ foxmail. com TE22. + 3 A 8 20 80 Pd Fe ~ 3 9 0 5 ~ 3 2 3 Dow H R o 4 Simoneit DSDP 4-368 5 6 /3 ~ 2 / 7 3 2 40 8 4070300 407206. 200--05 20-0-5

80 29 5 3 38 3 8 4 4 000 m 5 500 m 40 km 2 km 80 2 900 m Fig. Geological diagram of the Sampling sites

4 8 Table Basic geochemical parameter table of the samples /cm TOC /% R o /% H /C O /C A /% /0-6 W008 20 0. 30 3. 84 0. 385 0. 095 0. 0030 5. 8 W009 50 0. 29 3. 45 0. 404 0. 096 0. 003 7. 23 W00 00 0. 3 2. 87 0. 65 0. 32 0. 002 9. 74 W0 80 0. 32 2. 06 0. 499 0. 44 0. 002 8. 26 W02 300 0. 35 2. 06 0. 508 0. 08 0. 0020 9. 5 W03 500 0. 39 2. 0. 495 0. 074 0. 0040 2. 54 W04 000 0. 37 2. 4 0. 55 0. 3 0. 007. 53 W05 700 0. 36 2. 05 0. 539 0. 092 0. 005 9. 89 2 8 W008 ~ W05 20 cm 50 cm 00 cm 80 cm 300 cm 500 cm 000 cm 700 cm 8 R o R o > 2 R o 2% Fig. 2 The variation characteristics of organic matter maturity in the rock side W05 W04 W03 W02 W0 R o 2. 05% 2. 4% 2. % 2. 06% 2. 06% W00 W009 W008 R o 2. 87% 3. 45% 3. 84% 2 R o. 8 m H /C O /C H /C O / C H /C 0. 385 ~ 0. 65 O /C 0. 092 ~ 0. 44 3 H /C O /C R o 2% R o 3 H /C 3 Tissot 984 6 Fig. 3 Thermal evolution characteristics variation diagram of O O /C different types of kerogens after Tissot et al. 984

82 29 8 W02 H /C 4 W008 W009 H / C 0. 385 0. 404W0 ~ W05 H /C 0. 5 W00 H /C 0. 65 W008 W009 W00 W02 W04 6 O /C 0. W008 W009 O /C W00 W0 R o 6 Fig. 6 Saturated hydrocarbon total lon chromatogram of organic matter maturity in the rock side 6 4 H /C O /C Fig. 4 The variation characteristics of atomic ratio of H /C and O /C of the mudstone organic matter C 3 ~ C 33 C 8 C 27 2 5 CPI CPI W02 W04. 2 2 W009 50 0. 26 0. 97. 9 5 A W00 00 0. 37. 28. 4 Fig. 5 The variation characteristics of chloroform asphalt " A" W02 300 0. 8. 06. 2 and total hydrocarbon of the mudstone organic matter W04 000 0. 27 0. 84. 22 2 Table 2 Saturated hydrocarbon parameter table of organic matter maturity in the rock side /cm Pr /Ph C 22 - / C 23 + CPI W008 20 0. 4. 23. 09 5 A CPI W008 W009 W00 W008 CPI W02 W04 A W009 ~

4 83. 8 m CPI 6 3 995 40 09-022 Sun Yongge Fu Jiamo Liu Dehan et al. Effect of volcanism on maturation of sedimentary organic matter and its significance for hydrocarbon generation a case The east sag of Li- aohe Basin J 8.. 2006 26 3 325-334 Gu Tuan Chen Shufeng Yuan Li et al. Geochemical characteristics of Cenozoic volcanic rocks and their correlations with hydrocarbon accu- R o H /C O /C A 5 8 J. 8 m mulation in Liaohe Basin J. 8 m 2002 23 5-0 Guo Zhanqian. On volcanic activity and genera- tion of hydrocarbons J 5-0 pressured fluid compartments J References Cretaceous black shale by diabase intrusions in the Eastern Atlantic-. Ⅱ. Effects on bitumen and kerogen J. Geochimica et Cosmochimica J. 990 73-77 Wang Youxiao Acta 98 45 582-602 Fan Pu Cheng Xuehui et al. Abnormal geothermal influence on hydrocarbon genesis of sedimentary organics J. Oil & Gas Geology 990 73-77 322 Cao Xuewei Hu Wenxuan Jin Zhijun et al. 2. J. 997 6 4 59-65 Feng Qiao Tang Xiyuan. Magma activity s influence of conditions forming oil and gas pool J. Geological Science and Technology Information 997 6 4 59-65 4. 3. J. J. 200 9 4 598-604 Wang Zhiyong 2000 6 2 7-22 Li Yahui. Diabase and hydrocarbon reservoir formation on the northern slope of Gaoyou sag J. Journal of Wei Yanzhao Zhao Changyi. The immature oils in Santanghu Basin Geomechanics 2000 6 2 7-22 5. 4. J. 2009 3 5 462-465 J. 2003 25 20-25 Wan Gao Gang Liang Hao Shen Xia et al. Permian igneous rock distribution and its influence to the thermal evolution of source rock Congli Jin Qiang. Study on exceptional hydrocarbons generating and in eliminating of gabbros to source rocks in Chunxi area of Dongying depression J. Journal of Chang an University Earth Science Edition 5 462-465 2003 25 20-25 6 Tissot B P Welte D H. Petroleum Formation and Occurrence Second 5. Revised and Enlarged Edition M. Berlin Springer-Verlag 984 J. -699 989 29-37 Chen Rongshu Wang Qingling He Sheng et al Primary exploration of influence of the magmatic activity on organic maturation Case study on the Geyucheng-wen an area of central Hebei J. Petroleum Exploration and Development 989 29-37. J.. Chinese Science Bulletin 995 40 7 446-450 7 Raymond A C Murchison D G. Effect of volcanic activity on level of organic maturation in Carboniferous rocks of East File J. Midland valley of Scotland Fuel 988 67 64-66 3 325-334. Acta Mineralogica Sinica 2006 26 9. J.. Xinjiang Petroleum Geology 2002 23 0 Hunt J M. Generation and migration of petroleum from abnormally 2. AAPG Bulletin 990 74 - Wallace G Dow. Kerogen studies and geological interpretations J. Journal of Geochemical Exploration 977 7 79-99 2 Simoneit B R T Bernner S Peters K E et al. Thermal alteration of 3. 38 J. 2005 26 3 37- Influences of thermal effect of diabase intrusion on hydrocarbon generation in Xia 38 wellblock Linpan oilfield J. Oil & Gas Geology 2005 26 3 37-322 J. Acta Sedimentologica Sinica 200 9 4 598-604 Santanghu Basin J. Petroleum Geology & Experiment 2009 3

84 29 Influence of Abnormal Geothermal on Hydrocarbon-Generation Case study on the diabase intrusion of the Santanghu Basin LIU Xing-wang 2 WANG Xiao-feng SHI Bao-guang WANG Zuo-dong YANG Xing 2 ZHENG Jian-jing LIU Chun-yan 3. Key Laboratory of Petroleum Resources Research Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou 730000 2. Graduate School of Chinese Academy of Sciences Beijing 00049 3. Department of Petroleum Engineering Chengde Petroleum College Chengde Hebei 067000 Abstract In order to probe into abnormal geothermal 's influence on hydrocarbon-generation we collected eight source rock samples W008-W05 from the black mudstone series of strata of Carboniferous upper Haerjiawu group on the south side of the diabase intrusion of the East Daheishan Profile in the Santanghu Basin whose distance to the diabase rock is 20 cm 50 cm 00 cm 80 cm 300 cm 500 cm 000 cm and 700 cm respectively. Through analysis of the basic geochemical characteristics such as the atomic ratios of R o to H /C and to O /C the change of the chloroform bitumen " A" and total hydrocarbon of the eight samples along with selective analysis of the chromatographic characteristics of the saturated hydrocarbon of five of them we found that with the distance to the diabase rock greater than 80 cm the content of R o remains almost unchanged however the content of R o significantly increases with the distance less than 80 cm the atomic ratio of H /C in W008 and W009 is relatively small which is 0. 385 and 0. 404 while from W0 to W05 the atomic ratio of H /C is about 0. 5 which remains the same on the whole the range of variation in the atomic ratio of O /C is relatively small concentrating around 0. and the atomic ratio of O /C in W008 and W009 is slightly smaller than adjacent samples W00 W0 the chloroform bitumen " A" and total hydrocarbon of W008 is slightly higher than that of W009 ~ W02 from the pespective of organic saturated hydrocarbon parameters CPI in W008 W009 and W00 is relatively small which is obviously different from that of in W02 and W04. From the above analysis we can conclude that the overall maturity of this source rock is rather high and near the diabase intrusion with the distance range of ~. 8 m its maturity index has the trend of exceptional increase which shows the source rocks directly exposed to the intrusive rocks has a relative smaller scope of baking effect which is less than about. 8 m. Key words diabase abnormal geothermal hydrocarbon-generating maturation