Diagenetic evolution and its effect on reservoir-quality of fan delta sandstones during progressive burial: Evidence from the upper part of the fourth member of Shahejie formation, Bonan sag, Jiyang depression

Abstract

Petrographic analysis combined with various techniques, such as thin section identification, fluid inclusions, isotopic data, petro-physical property testing and oil testing results, was used to study diagenetic evolution and its effect on reservoir-quality of fan delta reservoirs of Es4s in the Bonan sag. The diagenesis is principally characterized by strong compaction, undercompaction, multi-phase of dissolution and cementation. Compaction played a more important role than cementation in destroying the primary porosity of the sandstones. The reservoirs have experienced complicated diagenetic environment evolution of “weak alkaline- acid-alkalinity-acid-weak alkalinity” and two-stage of hydrocarbon filling. The diagenetic sequences are summarized as “early compaction/early pyrite/gypsum/calcite/dolomite cementation→feldspar dissolution/the first stage of quartz overgrowth → early hydrocarbon filling→quartz dissolution/anhydrite/Fe-carbonate cementation→Fe-carbonate dissolution/feldspar dissolution/ the second stage of quartz overgrowth → later hydrocarbon filling→later pyrite cementation. In the same diagenetic context, the diagenetic evolution processes that occurred in different sub/micro-facies during progressive burial have resulted in heterogeneous reservoir properties and oiliness. The braided channel reservoirs in fan delta plain are poorly sorted with high matrix contents. The physical properties decrease continually due to the principally strong compaction and weak dissolution. The present properties of braided channel reservoirs are extremely poor, which is evidenced by few oil layers developed in relatively shallow strata while dry layers entirely in deep. The reservoirs both in the underwater distributary channels and mouth bars are well sorted and have a strong ability to resist compaction. Abundant pores are developed in medium-deep strata because of modifications by two-stage of acidic dissolution and hydrocarbon filling. The present properties are relatively well both in the underwater distributary channels and mouth bars and plenty of oil layers are developed in different burial depth. The present reservoir properties both in interdistributary channel and pre-fan delta are poor caused by extensively cementation. Small amounts of oil layers, oil-water layers and oil-bearing layers are developed in relatively shallow strata while dry layers totally in deep.

Keywords

diagenetic evolution / deep strata / fan delta / Es4s / Bonan sag

References

[1] WangY-z, CaoY-c, LiY-x, WangS-p, XiK-lai. Controlling factors on the Paleogene deep effective reservoirs in the Bonan sag [J]. Natural Gas Geoscience, 2012, 23(6): 996-1003

[2] WuF-q, LiH-s, HuX, LuiJ-d, SunX-wen. An approach to the composite petroleum systems of Es4s in Bonan sag [J]. Petroleum Exploration and Development, 2002, 29(3): 29-31

[3] GongX-m, ZengJ-hui. Impact of Paleogene evaporates on hydrocarbon accumulation in deep Bonan Sub-sag, Jiyang depression [J]. Petroleum Exploration and Development, 2003, 30(5): 24-27

[4] ZhongW-p, CaoY-c, WangY-z, LiuHui. The types and distribution of the sand bodies in Sha4 member in Bonan Depression [J]. Petroleum Geology and Recovery Efficiency, 2010, 17(1): 48-51

[5] WuF-q, XianX-f, LiH-s, LiuJ-duo. Deep reservoir forming mechanism in the upper part of the fourth member of shahejie formation in bonan subsag of Shengli Oil Field [J]. Acta Petrolei Sinica, 2003, 24(1): 44-48

[6] FolkR LPetrology of sedimentary rocks [M], 1968TexasHemphill Press107-108

[7] WolelaA. Diagenetic evolution and reservoir potential of the barremian-cenomanian debre libanose sandstone, blue nile (Abay) basin, Ethiopia [J]. Cretaceous Research, 2012, 36: 83-95

[8] NymanS L, GaniM R, BhattacharyaJ P, LeeK. Origin and distribution of calcite concretions in Cretaceous Wall Creek Member, Wyoming: Reservoir-quality implication for shallowmarine deltaic strata [J]. Cretaceous Research, 2014, 48: 139-152

[9] DuttonS P, WhiteC D, WillisB J. Calcite cement distribution and its effect on fluid flow in a deltaic sandstone, frontier formation, Wyoming [J]. AAPG Bulletin, 2002, 96: 2007-2021

[10] DuttonS P. Calcite cement in Permian deep-water sandstones, delaware basin, west Texas: Origin, distribution, and effect on reservoir properties [J]. AAPG Bulletin, 2008, 92(6): 765-787

[11] LynchF L, LandL S. Diagenesis of calcite cement in Frio Formation sandstones and its relationship to formation water Chemistry [J]. Journal of Sedimentary Research, 1996, 66(3): 439-466

[12] HaddadS C, WordenR H, PriorD J, SmalleyP C. Quartz cement in the fontainebleau sandstone, paris basin, france: crystallography and implications for mechanisms of cement growth [J]. Journal of Sedimentary Research, 2006, 76: 244-256

[13] BjørlykkeK, EgebergP K. Quartz cementation in sedimentary basins [J]. AAPG Bulletin, 1993, 77: 1538-1548

[14] PeltonenC, Marcussen, BjørlykkeK, JahrenJ. Clay mineral diagenesis and quartz cementation in mudstones: The effects of smectite to illite reaction on rock properties [J]. Marine and Petroleum Geology, 2009, 26: 887-898

[15] HarwoodJ, AplinA C, FialipsC I, IliffeJ E, KozdonR, UshikuboT, ValleyJ. Quartz cementation history of sandstones revealed by high-resolution sims oxygen isotope analysis [J]. Journal of Sedimentary Research, 2013, 83: 522-530

[16] RahmanM J, MccannT. Diagenetic history of the surma group sandstones (Miocene) in the surma basin, Bangladesh [J]. Journal of Asian Earth Sciences, 2012, 45: 65-78

[17] WordenR, MoradS. Quartz cement in oil field sandstones: A review of the critical problems [J]. International Association of Sedimentolgists, 2000, 29: 1-20

[18] WordenR, MoradS. Clay minerals in sandstones: controls on formation, distribution and evolution [J]. International Association of Sedimentolgists, 2003, 34: 3-41

[19] AmadiF O, MajorR P, BariaL R. Origins of gypsum in deep carbonate reservoirs: Implications for hydrocarbon exploration and production [J]. AAPG Bulletin, 2012, 96(2): 375-390

[20] HarrisonT N. Experimental VNIR reflectance spectroscopy of gypsum dehydration: Investigating the gypsum to bassanite transition [J]. American Mineralogist, 2012, 97: 598-609

[21] JordanG, AstillerosJ M. In situ HAFM study of the thermal dehydration on gypsum (010) surfaces [J]. American Mineralogist, 2006, 91: 619-627

[22] FranksS G, ZwingmannH. Origin and timing of late diagenetic illite in the permian–carboniferous unayzah sandstone reservoirs of saudi Arabia [J]. AAPG Bulletin, 2010, 94(8): 1133-1159

[23] LynchF L, MackL E, AndlandL S. Burial diagenesis of illite/smectite in shales and the origins of authigenic quartz and secondary porosity in sandstones [J]. Geochimica et Cosmochimica Acta, 1997, 61: 1995-2006

[24] BottrellS H, ParkesJ, CraggB A. Isotopic evidence for deep pyrite oxidation and stimulation of bacterial sulphate reduction [J]. J Geol Soc London, 2000, 157: 711-714

[25] HouseknechtD W. Assessing the relative importance of compaction processes and cementation to reduction of porosity in sandstones [J]. AAGR Bulletin, 1987, 71: 633-642

[26] ElghaliM A, MoradS, MansurbegH, CajaM A, OgleN. Diagenetic alterations related to marine transgression and regression in fluvial and shallow marine sandstones of the Triassic Buntsandstein and Keuper sequence, the Paris Basin, France [J]. Marine and Petroleum Geology, 2009, 26: 289-309

[27] BechtelA, SavinS M, HoernesS. Oxygen and hydrogen isotopic composition of clay minerals of the Bahloul Formation in the region of the Bou Grine zine-lead ore deposit (Tunisia): Evidence for fluid-rock interaction in the vicinity of salt dome cap rock [J]. Chemical Geology, 1999, 156: 191-207

[28] SantosA E, RossettiD F, MurrayH H. Origins of the Rio Capim kaolinites (northern Brazil) revealed by d18O and d18D analyses [J]. Applied Clay Science, 2007, 37: 281-294

[29] O’NeilJ R, ClaytonR N, MayedaT K. Oxygen isotope fractionation in divalent metal carbonates [J]. The Journal of Chemical Physics, 1969, 51(12): 5547-5558

[30] MatthewsA, KatzA. Oxygen isotope fractionation during the dolomitization of calcium carbonate [J]. Geochimica et Cosmochimica Acta, 1977, 41: 1431-1438

[31] CoplenT B, KendallC, HoppleJ. Comparision of stable isotope reference samples [J]. Nature, 1983, 302: 236-238

[32] CaoY-c, MaB-b, WangY-z, LiXue. Genetic mechanisms and classified evaluation of low permeability reservoirs of Es4s in the north zone of the Bonan sag [J]. Natural Gas Geoscience, 2013, 24(5): 866-875

[33] CurtisC D. Possible links between sandstone diagenesis and depth-related geochemical reactions occurring in enclosing mudstones [J]. J Geol Soc Lond, 1978, 135: 107-117

[34] RaiswellR, BottrellS H, DeanS P, MarshallJ D, CarrA, HatfieldD. Isotopic constraints on growth conditions of multiphase calcite–pyrite–barite concretions in Carboniferous mudstones [J]. Sedimentology, 2002, 49: 237-254

[35] GongX-m, JinZ-j, ZengJ-h, QiuN-sheng. Resrvoiring characteristics and main controlling factors for deep hydrocarbon accumulations in Bonan sag in Jiyang depression [J]. Oil & Gas Geology, 2005, 26(4): 473-479

[36] XuX-y, XuG-s, TaiR-shen. Study on hydrocarbon migration and accumulation of Member 4 of Shahejie Formation in Bonan sag, Zhanhua depression, China [J]. Journal of Chengdu university of technology: Science & Technology Edition, 2008, 35(2): 113-120

[37] SurdamR C, CrosseyL J, HagenE S. Organic-inorganic interactions and sandstone diagenesis [J]. AAPG Bulletin, 1989, 73: 1-23

[38] JinZ-j, CaoJ, HuW-x, ZhangY-j, YaoS-p, WangX-l, ZhangY-q, TangY, ShiX-pu. Episodic petroleum fluid migration in fault zones of the northwestern Junggar Basin (northwest China): Evidence from hydrocarbon-bearing zoned calcite cement [J]. AAPG Bulletin, 2008, 92(9): 1225-1243

[39] WuF-q, NingX-xian. The controlling factors and processes for the formation of the secondary porosity of the deep-seated reservoir rocks in the Bonan depression, Shandong [J]. Sedimentary Geology and Tethyan Geology, 2004, 24(2): 76-82